defconfig: lahaina: Enable gpu devfreq governors for GKI

Enable gpu governors, on GKI builds,  to dynamically scale gpu
frequency and bus frequency based on gpu load.

Change-Id: I883851b6462cc731adb8c5cb04faac3ab877e55d
Signed-off-by: Raghu Ananya Arabolu <rarabolu@codeaurora.org>