staging: android-alarm: Don't use save_time_delta.

Remove references to non-existant save_time_delta.

CC: Arve Hjønnevåg <arve@android.com>
CC: Android Kernel Team <kernel-team@android.com>
Signed-off-by: Arve Hjønnevåg <arve@android.com>
[Added commit message -jstultz]
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Change-Id: Iaefeca497de02fe36b7f5d79075912f6e349ec53