arch/x86: Use 'enum cb_err'

Change-Id: I38e4b8c6adfaaa45377b2fbe0644285d21841cd1
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/68369
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin L Roth <gaumless@gmail.com>
Reviewed-by: Felix Singer <felixsinger@posteo.net>

src/include/random.h

@@ -2,13 +2,13 @@
 #ifndef _RANDOM_H_
 #define _RANDOM_H_
 
-#include <stdint.h>
+#include <types.h>
 
 /*
  * Generates a 32/64 bit random number respectively.
  * return 0 on success and -1 on error.
  */
-int get_random_number_32(uint32_t *rand);
-int get_random_number_64(uint64_t *rand);
+enum cb_err get_random_number_32(uint32_t *rand);
+enum cb_err get_random_number_64(uint64_t *rand);
 
 #endif /* _RANDOM_H_ */