ANDROID: Revert "ANDROID: gki_defconfig: removed CONFIG_PM_WAKELOCKS"

CONFIG_PM_WAKELOCKS are needed by existing driver code that uses
APIs like pm_wake_lock/unlock(). We can't disable yet just yet even
though userspace has stopped using the /sys/power/wake_lock interface.

This reverts commit b82fc46d.

Bug: 148922129
Test: Boot
Change-Id: I8b8f4f46db3647313485abff21a5659bd881b687
Signed-off-by: Sandeep Patil <sspatil@google.com>