LCD 6E63M0: Fix screen delay on wake up

 - Added Kconfig bool to select panel early_suspend / late_resume function
 - Added mutex protection to late resume
 - Added logic to verify LCD regulator state
 - Fixed ambiguous/duplicate logic in s6e63m0_disp_powerup(void)

Change-Id: I8ed6f6a33d394ab62eabbd4b29c1d43be28f5a67