Select performance kernel for user build

CONFIG_DEBUG_FS is not allowed to be enabled as kernel config
in user builds but is allowed for userdebug builds. Disable
CONFIG_DEBUG_FS in performance kernel and select it for user build.

Bug: 149437148
Test: compile and check kernel config
Change-Id: Ia41aaacf5b6b37607cfa7082e69661eb7caa8f5e