treewide: Make carray arrays const and NULL-terminated

This allows the compiler to generate significantly better code, because
it does not have to maintain either the loop counter or loop limit. Plus
there are half as many symbols to relocate. This also simplifies passing
carray arrays to helper functions.

Signed-off-by: Samuel Holland <samuel.holland@sifive.com>
Reviewed-by: Anup Patel <anup@brainfault.org>

scripts/carray.sh

@@ -69,10 +69,9 @@ for VAR in ${VAR_LIST}; do
 done
 printf "\n"
 
-printf "%s *%s[] = {\n" "${TYPE_NAME}" "${ARRAY_NAME}"
+printf "%s *const %s[] = {\n" "${TYPE_NAME}" "${ARRAY_NAME}"
 for VAR in ${VAR_LIST}; do
 	printf "\t&%s,\n" "${VAR}"
 done
-printf "};\n\n"
-
-printf "unsigned long %s_size = sizeof(%s) / sizeof(%s *);\n" "${ARRAY_NAME}" "${ARRAY_NAME}" "${TYPE_NAME}"
+	printf "\tNULL\n"
+printf "};\n"