soc/intel/meteorlake: Change VBOOT_HASH_BLOCK_SIZE to 4 KiB

Default VBOOT_HASH_BLOCK_SIZE is 1 KiB and increasing it to 4 KiB
helps in improving overall boot time since it reduces hashing and
body loading time (~30ms).

Backport changes from commit hash 84532dae1 (soc/intel/alderlake:
Change VBOOT_HASH_BLOCK_SIZE to 4 KiB).

Signed-off-by: Subrata Banik <subratabanik@google.com>
Change-Id: I3784b99bf06e0c03d123f290a98a0b1e4528b8d4
Reviewed-on: https://review.coreboot.org/c/coreboot/+/64792
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Reviewed-by: Tarun Tuli <taruntuli@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/meteorlake/Kconfig

@@ -129,6 +129,12 @@ config VBOOT
 	select VBOOT_VBNV_CMOS_BACKUP_TO_FLASH
 	select VBOOT_X86_SHA256_ACCELERATION
 
+# Default hash block size is 1KiB. Increasing it to 4KiB to improve
+# hashing time as well as read time.
+config VBOOT_HASH_BLOCK_SIZE
+	hex
+	default 0x1000
+
 config CBFS_SIZE
 	hex
 	default 0x200000