don't use register keyword

firmware/util/datalogging.cpp

@@ -112,7 +112,7 @@ void append(Logging *logging, const char *text) {
  * @note This method if fast because it does not validate much, be sure what you are doing
  */
 void appendFast(Logging *logging, const char *text) {
-	register char *s;
+	char *s;
 	s = logging->linePointer;
 	while ((*s++ = *text++) != 0)
 		;

firmware/util/efilib.cpp

@@ -64,7 +64,7 @@ float clampF(float min, float clamp, float max) {
 }
 
 uint32_t efiStrlen(const char *param) {
-	register const char *s;
+	const char *s;
 	for (s = param; *s; ++s)
 		;
 	return (s - param);