Simplify _ALIGN_TEXT.

Bug: 16872067
Change-Id: I2b622f252c21ce1b344c040f828ab3f4bf9b6c0a
diff --git a/libc/arch-arm64/include/machine/asm.h b/libc/arch-arm64/include/machine/asm.h
index 31b5c63..2bea043 100644
--- a/libc/arch-arm64/include/machine/asm.h
+++ b/libc/arch-arm64/include/machine/asm.h
@@ -38,9 +38,7 @@
 #ifndef _AARCH64_ASM_H_
 #define _AARCH64_ASM_H_
 
-#ifndef _ALIGN_TEXT
-# define _ALIGN_TEXT .align 0
-#endif
+#define __bionic_asm_align 0
 
 #undef __bionic_asm_function_type
 #define __bionic_asm_function_type %function