src/lib: Capitalize ROM, RAM, NVRAM and CPU

Change-Id: Id0871b0c2eb31e2d728180b44cc5b518b751add4
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/15985
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Omar Pakker
Reviewed-by: Martin Roth <martinroth@google.com>

src/lib/thread.c

@@ -43,7 +43,7 @@ static inline int thread_can_yield(const struct thread *t)
 	return (t != NULL && t->can_yield);
 }
 
-/* Assumes current cpu info can switch. */
+/* Assumes current CPU info can switch. */
 static inline struct thread *cpu_info_to_thread(const struct cpu_info *ci)
 {
 	return ci->thread;