src: use ARRAY_SIZE where possible

Generated with a variant of
https://coccinelle.gitlabpages.inria.fr/website/rules/array.cocci

Change-Id: I083704fd48faeb6c67bba3367fbcfe554a9f7c66
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50594
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/mainboard/google/nyan_big/sdram_configs.c b/src/mainboard/google/nyan_big/sdram_configs.c
index 7193d7b..15ed489 100644
--- a/src/mainboard/google/nyan_big/sdram_configs.c
+++ b/src/mainboard/google/nyan_big/sdram_configs.c
@@ -33,7 +33,7 @@
 	 */
 
 	printk(BIOS_SPEW, "%s: RAMCODE=%d\n", __func__, ramcode);
-	if (ramcode >= sizeof(sdram_configs) / sizeof(sdram_configs[0]) ||
+	if (ramcode >= ARRAY_SIZE(sdram_configs) ||
 	    sdram_configs[ramcode].MemoryType == NvBootMemoryType_Unused) {
 		die("Invalid RAMCODE.");
 	}