configs: support psi tracking

Now we have psi tracking support in kernel code, let's make it support
in kconfig.
As of now, we require a boot parameter to enable psi tracking for
performance impact concern. That means we disable it by default, and
user can pass a boot parameter "psi=1" to enable it if they want this
feature.
Signed-off-by: NJoseph Qi <joseph.qi@linux.alibaba.com>

config-4.19.y-x86_64

@@ -100,6 +100,8 @@ CONFIG_TASKSTATS=y
 CONFIG_TASK_DELAY_ACCT=y
 CONFIG_TASK_XACCT=y
 CONFIG_TASK_IO_ACCOUNTING=y
+CONFIG_PSI=y
+CONFIG_PSI_DEFAULT_DISABLED=y
 CONFIG_CPU_ISOLATION=y
 
 #

config-4.19.y-x86_64-debug

@@ -102,6 +102,8 @@ CONFIG_TASKSTATS=y
 CONFIG_TASK_DELAY_ACCT=y
 CONFIG_TASK_XACCT=y
 CONFIG_TASK_IO_ACCOUNTING=y
+CONFIG_PSI=y
+CONFIG_PSI_DEFAULT_DISABLED=y
 CONFIG_CPU_ISOLATION=y
 
 #