Simplify _ALIGN_TEXT.

Bug: 16872067
Change-Id: I2b622f252c21ce1b344c040f828ab3f4bf9b6c0a
diff --git a/libc/arch-mips/include/machine/asm.h b/libc/arch-mips/include/machine/asm.h
index 5eacde3..cdc7914 100644
--- a/libc/arch-mips/include/machine/asm.h
+++ b/libc/arch-mips/include/machine/asm.h
@@ -28,9 +28,7 @@
 #ifndef _MIPS64_ASM_H
 #define _MIPS64_ASM_H
 
-#ifndef _ALIGN_TEXT
-# define _ALIGN_TEXT .align 4
-#endif
+#define __bionic_asm_align 4
 
 #undef __bionic_asm_custom_entry
 #undef __bionic_asm_custom_end