xen/arm64: cache: Use the generic xen/linkage.h macros

Use the generic xen/linkage.h macros to annotate code symbols.

Signed-off-by: Edgar E. Iglesias <edgar.iglesias@amd.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>

xen/arch/arm/arm64/cache.S

@@ -40,7 +40,7 @@
  *	- kaddr   - kernel address
  *	- size    - size in question
  */
-ENTRY(__flush_dcache_area)
+FUNC(__flush_dcache_area)
 	dcache_line_size x2, x3
 	add	x1, x0, x1
 	sub	x3, x2, #1
@@ -51,4 +51,4 @@ ENTRY(__flush_dcache_area)
 	b.lo	1b
 	dsb	sy
 	ret
-ENDPROC(__flush_dcache_area)
+END(__flush_dcache_area)