libc: malloc: match implementation to declaration

The identifiers used in the declaration and definition of a function
shall be identical [MISRAC2012-RULE_8_3-b]

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

lib/libc/minimal/source/stdlib/malloc.c

@@ -123,10 +123,10 @@ void free(void *ptr)
 	ARG_UNUSED(ptr);
 }
 
-void *realloc(void *ptr, size_t requested_size)
+void *realloc(void *ptr, size_t size)
 {
 	ARG_UNUSED(ptr);
-	return malloc(requested_size);
+	return malloc(size);
 }
 #endif