UBUNTU: [Config]: add CONFIG_LDISC_AUTOLOAD=y

BugLink: https://bugs.launchpad.net/bugs/1828420

Upstream commit 7c0cca7c ("tty: ldisc:
add sysctl to prevent autoloading of ldiscs") backport applied as part
of upstream stable update to Linux 4.4.179 adds a new config option
LDISC_AUTOLOAD which default value is "y". Update the Ubuntu configs
accordingly.
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

debian.master/config/config.common.ubuntu

@@ -4134,6 +4134,7 @@ CONFIG_LCD_S6E63M0=m
 CONFIG_LCD_TDO24M=m
 CONFIG_LCD_VGG2432A4=m
 CONFIG_LCS=m
+CONFIG_LDISC_AUTOLOAD=y
 # CONFIG_LDM_DEBUG is not set
 CONFIG_LEDS_88PM860X=m
 CONFIG_LEDS_AAT1290=m