Unify our assembler macros.

Our <machine/asm.h> files were modified from upstream, to the extent
that no architecture was actually using the upstream ENTRY or END macros,
assuming that architecture even had such a macro upstream. This patch moves
everyone to the same macros, with just a few tweaks remaining in the
<machine/asm.h> files, which no one should now use directly.

I've removed most of the unused cruft from the <machine/asm.h> files, though
there's still rather a lot in the mips/mips64 ones.

Bug: 12229603
Change-Id: I2fff287dc571ac1087abe9070362fb9420d85d6d
diff --git a/libc/arch-arm/bionic/setjmp.S b/libc/arch-arm/bionic/setjmp.S
index 8927086..ed59d07 100644
--- a/libc/arch-arm/bionic/setjmp.S
+++ b/libc/arch-arm/bionic/setjmp.S
@@ -34,7 +34,7 @@
  * SUCH DAMAGE.
  */
 
-#include <machine/asm.h>
+#include <private/bionic_asm.h>
 #include <machine/setjmp.h>
 #include <machine/cpu-features.h>
 
@@ -112,7 +112,7 @@
 
 	add	sp, sp, #4	/* unalign the stack */
 	.cfi_adjust_cfa_offset -4
-	ldmfd	sp!, {r0, r1, r14} 
+	ldmfd	sp!, {r0, r1, r14}
 	.cfi_def_cfa_offset 0
 
 #ifdef __ARM_HAVE_VFP