hwc: remove unused padded nv12 format

The padded NV12 format was never used.

Change-Id: I4796c71518edb3cd1c1a5daeed2a0045a45ca539
Signed-off-by: Tony Lofthouse <a0741364@ti.com>
(cherry picked from commit e3fe422bac3fba2f72c96b422c5d5a5e9fe04e8d)

Conflicts:

	hwc/hwc.c
1 file changed