UBUNTU: [Config] CONFIG_LOG_BUF_SHIFT=18 on all 64bit arches

BugLink: https://bugs.launchpad.net/bugs/1824864

All other archs have this value set higher, and the low value of 14
results in a log buffer so small it fills up before systemd-journald
can start and read all the boot time kernel log messages.

Increasing this will result in more memory reserved for the log buffer,
but will avoid missed kernel log messages.

This changes all 64 bit archs to use a shift of 18, which is what
amd64 has been using.
Signed-off-by: Dan Streetman <ddstreet@canonical.com>
Cc: Dimitri John Ledkov <xnox@ubuntu.com>
Acked-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
[ kleber: fixed subject line. ]
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

debian.master/config/annotations

@@ -7667,7 +7667,7 @@ CONFIG_USELIB                                   policy<{'amd64': 'y', 'arm64': '
 CONFIG_AUDIT                                    policy<{'amd64': 'y', 'arm64': 'y', 'armhf': 'y', 'i386': 'y', 'powerpc': 'y', 'ppc64el': 'y', 's390x': 'y'}>
 CONFIG_AUDITSYSCALL                             policy<{'amd64': 'y', 'arm64': 'y', 'armhf': 'y', 'i386': 'y', 'powerpc': 'y', 'ppc64el': 'y', 's390x': 'y'}>
 CONFIG_IKCONFIG                                 policy<{'amd64': 'n', 'arm64': 'n', 'armhf': 'n', 'i386': 'n', 'powerpc': 'n', 'ppc64el': 'n', 's390x': 'n'}>
-CONFIG_LOG_BUF_SHIFT                            policy<{'amd64': '18', 'arm64': '14', 'armhf': '17', 'i386': '17', 'powerpc': '17', 'ppc64el': '17', 's390x': '17'}>
+CONFIG_LOG_BUF_SHIFT                            policy<{'amd64': '18', 'arm64': '18', 'armhf': '17', 'i386': '17', 'powerpc': '18', 'ppc64el': '18', 's390x': '18'}>
 CONFIG_LOG_CPU_MAX_BUF_SHIFT                    policy<{'amd64': '12', 'arm64': '12', 'armhf': '12', 'i386': '12', 'powerpc': '12', 'ppc64el': '12', 's390x': '12'}>
 CONFIG_NUMA_BALANCING                           policy<{'amd64': 'y', 'powerpc-powerpc64-smp': 'y', 'ppc64el': 'y'}>
 CONFIG_NUMA_BALANCING_DEFAULT_ENABLED           policy<{'amd64': 'y', 'powerpc-powerpc64-smp': 'y', 'ppc64el': 'y', 's390x': 'n'}>

debian.master/config/arm64/config.common.arm64

@@ -169,7 +169,7 @@ CONFIG_LAPB=m
 CONFIG_LDM_PARTITION=y
 CONFIG_LIBNVDIMM=y
 CONFIG_LLC2=m
-CONFIG_LOG_BUF_SHIFT=14
+CONFIG_LOG_BUF_SHIFT=18
 CONFIG_LPC_ICH=m
 CONFIG_LPC_SCH=m
 CONFIG_MAC_PARTITION=y

debian.master/config/powerpc/config.common.powerpc

@@ -153,7 +153,7 @@ CONFIG_LAPB=m
 CONFIG_LDM_PARTITION=y
 CONFIG_LIBNVDIMM=y
 CONFIG_LLC2=m
-CONFIG_LOG_BUF_SHIFT=17
+CONFIG_LOG_BUF_SHIFT=18
 # CONFIG_LPARCFG is not set
 CONFIG_LPC_ICH=m
 CONFIG_LPC_SCH=m

debian.master/config/ppc64el/config.common.ppc64el

@@ -174,7 +174,7 @@ CONFIG_LAPB=m
 CONFIG_LDM_PARTITION=y
 CONFIG_LIBNVDIMM=y
 CONFIG_LLC2=m
-CONFIG_LOG_BUF_SHIFT=17
+CONFIG_LOG_BUF_SHIFT=18
 CONFIG_LPARCFG=y
 CONFIG_LPC_ICH=m
 CONFIG_LPC_SCH=m

debian.master/config/s390x/config.common.s390x

@@ -139,7 +139,7 @@ CONFIG_KVM=y
 # CONFIG_LDM_PARTITION is not set
 # CONFIG_LIBNVDIMM is not set
 # CONFIG_LLC2 is not set
-CONFIG_LOG_BUF_SHIFT=17
+CONFIG_LOG_BUF_SHIFT=18
 # CONFIG_LPC_ICH is not set
 # CONFIG_LPC_SCH is not set
 # CONFIG_MAC_PARTITION is not set