Skia: Fix special case in D32_A8_Opaque and _Black
Skia: Fix special case in D32_A8_Opaque and _Black

Neon optimization implemented for D32_A8_Opaque and D32_A8_Black
is not using the right mask for width>=2 and width<4 case. This
is fixed in this patch by handling 4 different cases: width >=8,
4<=width<7, 2<=width<4, and residual case.

Change-Id: I20bf1cc28eac08402d4133aac663ebfc393edbe0
Signed-off-by: Chet Kener <4bada73e411a9c678a318a79d04d7df4a5fc4429@gmail.com>

sombree/android_external_skia,sombree/android_external_skia,sombree/android_external_skia,sombree/android_external_skia,sombree/android_external_skia,sombree/android_external_skia,sombree/android_external_skia,sombree/android_external_skia