create-diff-object: Fix mapping symbol handling on aarch64

It seems mapping symbols in aarch64 elf has section size of 0.
So, exclude it in section symbol replacing code just like
kpatch_correlate_symbols().
This fixes the data-read-mostly unit test on aarch64.

Signed-off-by: Misono Tomohiro <misono.tomohiro@jp.fujitsu.com>
Signed-off-by: Puranjay Mohan <pjy@amazon.com>

Author: Misono Tomohiro

kpatch-build/create-diff-object.c

@@ -1706,6 +1706,9 @@ static void kpatch_replace_sections_syms(struct kpatch_elf *kelf)
 					 */
 				} else if (target_off == start && target_off == end) {
 
+					if(kpatch_is_mapping_symbol(kelf, sym))
+						continue;
+
 					/*
 					 * Allow replacement for references to
 					 * empty symbols.