powerpc: Enable lockup and hung task detectors in pseries and ppc64 defeconfigs

As a result of changes to Kconfig files, we no longer enable
the lockup and hung task detectors. Both are very light weight
and provide useful information in the event of a hang, so
reenable them.
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/configs/ppc64_defconfig

@@ -443,6 +443,8 @@ CONFIG_NLS_KOI8_U=m
 CONFIG_CRC_T10DIF=y
 CONFIG_MAGIC_SYSRQ=y
 CONFIG_DEBUG_KERNEL=y
+CONFIG_LOCKUP_DETECTOR=y
+CONFIG_DETECT_HUNG_TASK=y
 CONFIG_DEBUG_MUTEXES=y
 # CONFIG_RCU_CPU_STALL_DETECTOR is not set
 CONFIG_LATENCYTOP=y

arch/powerpc/configs/pseries_defconfig

@@ -321,6 +321,8 @@ CONFIG_NLS_ISO8859_1=y
 CONFIG_CRC_T10DIF=y
 CONFIG_MAGIC_SYSRQ=y
 CONFIG_DEBUG_KERNEL=y
+CONFIG_LOCKUP_DETECTOR=y
+CONFIG_DETECT_HUNG_TASK=y
 # CONFIG_RCU_CPU_STALL_DETECTOR is not set
 CONFIG_LATENCYTOP=y
 CONFIG_SYSCTL_SYSCALL_CHECK=y