configs/common: add HaaS specific kernel configuration

HaaS requires fair group scheduler so we should enable it. This ensures
that it is enabled so HaaS can build.

configs/common/kernel

@@ -91,3 +91,7 @@ CONFIG_KERNEL_WATCHDOG_PRETIMEOUT_DEFAULT_GOV_PANIC=y
 CONFIG_KERNEL_WATCHDOG_PRETIMEOUT_GOV_PANIC=y
 CONFIG_KERNEL_WATCHDOG_SYSFS=y
 CONFIG_KERNEL_WATCHDOG_NOWAYOUT=y
+
+# HaaS
+CONFIG_KERNEL_FAIR_GROUP_SCHED=y
+CONFIG_KERNEL_CFS_BANDWIDTH=y