src/include: Capitalize CPU, RAM and ROM

Change-Id: Id40c1bf868820c77ea20146d19c6d552c2f970c4
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/15942
Tested-by: build bot (Jenkins)
Reviewed-by: Omar Pakker
Reviewed-by: Martin Roth <martinroth@google.com>

src/include/cpu/x86/cache.h

@@ -52,7 +52,7 @@ static inline void invd(void)
 
 /* The following functions require the always_inline due to AMD
  * function STOP_CAR_AND_CPU that disables cache as
- * ram, the cache as ram stack can no longer be used. Called
+ * RAM, the cache as RAM stack can no longer be used. Called
  * functions must be inlined to avoid stack usage. Also, the
  * compiler must keep local variables register based and not
  * allocated them from the stack. With gcc 4.5.0, some functions