arm64: vdso: Convert to modern assembler annotations

In an effort to clarify and simplify the annotation of assembly
functions new macros have been introduced. These replace ENTRY and
ENDPROC with two different annotations for normal functions and those
with unusual calling conventions. Convert the assembly function in the
arm64 VDSO to the new macros.
Signed-off-by: NMark Brown <broonie@kernel.org>
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>

arch/arm64/kernel/vdso/sigreturn.S

@@ -14,7 +14,7 @@
 	.text
 
 	nop
-ENTRY(__kernel_rt_sigreturn)
+SYM_FUNC_START(__kernel_rt_sigreturn)
 	.cfi_startproc
 	.cfi_signal_frame
 	.cfi_def_cfa	x29, 0
@@ -23,4 +23,4 @@ ENTRY(__kernel_rt_sigreturn)
 	mov	x8, #__NR_rt_sigreturn
 	svc	#0
 	.cfi_endproc
-ENDPROC(__kernel_rt_sigreturn)
+SYM_FUNC_END(__kernel_rt_sigreturn)