graphics: use gr_flip_32() only if we're really on a 32bpp device.
graphics: use gr_flip_32() only if we're really on a 32bpp device.

Change-Id: I996b2dadf43477064480a47ee536e6ec395a6aad

Plain-Andy/android_platform_bootable_recovery,InsomniaAOSP/platform_bootable_recovery,DerTeufel/dualboot_recovery,randomblame/bootable_recovery,76Demented/bootable_recovery-,DerTeufel/dualboot_recovery,randomblame/bootable_recovery,76Demented/bootable_recovery-,InsomniaAOSP/platform_bootable_recovery,randomblame/bootable_recovery,randomblame/bootable_recovery,Plain-Andy/android_platform_bootable_recovery,kylinmoddev/android_bootable_recovery,Plain-Andy/android_platform_bootable_recovery,kylinmoddev/android_bootable_recovery,InsomniaAOSP/platform_bootable_recovery,randomblame/bootable_recovery,76Demented/bootable_recovery-,kylinmoddev/android_bootable_recovery,kylinmoddev/android_bootable_recovery,InsomniaAOSP/platform_bootable_recovery,Plain-Andy/android_platform_bootable_recovery,DerTeufel/dualboot_recovery,DerTeufel/dualboot_recovery,76Demented/bootable_recovery-,76Demented/bootable_recovery-,InsomniaAOSP/platform_bootable_recovery,DerTeufel/dualboot_recovery