drivers/intel/fsp2_0: Print `mrc_cache` size in decimal

This patch updates the print msg of mrc_cache size from hex to
decimal for easier understanding while debugging the issue.

TEST=Able to build and boot google/rex.

Without this patch:

[SPEW ]  MRC cache found, size ee75

With this patch:

[SPEW ]  MRC cache found, size 61045 bytes

Change-Id: I69feeb36423e47a5992c9f27d9a7042803a492cd
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/73490
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Reviewed-by: Ivy Jian <ivy.jian@quanta.corp-partner.google.com>
Reviewed-by: Dinesh Gehlot <digehlot@google.com>
diff --git a/src/drivers/intel/fsp2_0/memory_init.c b/src/drivers/intel/fsp2_0/memory_init.c
index 740b9c6..dcb44f6 100644
--- a/src/drivers/intel/fsp2_0/memory_init.c
+++ b/src/drivers/intel/fsp2_0/memory_init.c
@@ -86,7 +86,7 @@
 	/* MRC cache found */
 	arch_upd->NvsBufferPtr = (uintptr_t)data;
 
-	printk(BIOS_SPEW, "MRC cache found, size %zx\n", mrc_size);
+	printk(BIOS_SPEW, "MRC cache found, size %zu bytes\n", mrc_size);
 }
 
 static enum cb_err check_region_overlap(const struct memranges *ranges,