ANDROID: Enable PM_USERSPACE_AUTOSLEEP in gki_defconfig

Android initiates autosuspend thread from a userspace service.
Enable this option so that the kernel knows how to handle various
pm_notification callback for when suspend/wakeup transitions are
very frequent.

Bug: 389989850
Change-Id: I86d2c98e6bc9dc2c24dddd29a6c3da192953afcf
Signed-off-by: Kalesh Singh <kaleshsingh@google.com>