Replace .align with .balign to avoid ambiguity

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

Change-Id: Ibf2097da29f743f2c87c79d2a88ce1abd0aa6227
diff --git a/libpixelflinger/arch-mips/t32cb16blend.S b/libpixelflinger/arch-mips/t32cb16blend.S
index b365fd8..1d2fb8f 100644
--- a/libpixelflinger/arch-mips/t32cb16blend.S
+++ b/libpixelflinger/arch-mips/t32cb16blend.S
@@ -178,7 +178,7 @@
 #endif
 
     .text
-    .align 4
+    .balign 4
 
     .global scanline_t32cb16blend_mips
     .ent    scanline_t32cb16blend_mips