Replace .align with .balign to avoid ambiguity

Directive .align is arch-dependent, .balign is not.

Change-Id: Ibf2097da29f743f2c87c79d2a88ce1abd0aa6227
diff --git a/libpixelflinger/col32cb16blend_neon.S b/libpixelflinger/col32cb16blend_neon.S
index f000920..7ad34b0 100644
--- a/libpixelflinger/col32cb16blend_neon.S
+++ b/libpixelflinger/col32cb16blend_neon.S
@@ -17,7 +17,7 @@
 
 
     .text
-    .align 4
+    .balign 4
 
     .global scanline_col32cb16blend_neon