Don't use __ARM_HAVE_NEON to detect NEON's presence in SkBlitter_RGB16

Replace __ARM_HAVE_NEON by SK_ARM_NEON_IS_ALWAYS. It was the only
use of __ARM_HAVE_NEON apart from defining SK_ARM_NEON_IS_ALWAYS.

Signed-off-by: Kévin PETIT <kevin.petit@arm.com>

BUG=skia:
R=djsollen@google.com, mtklein@google.com, halcanary@google.com, reed@google.com

Author: kevin.petit@arm.com

Review URL: https://codereview.chromium.org/206543002

git-svn-id: http://skia.googlecode.com/svn/trunk@13880 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed