smbios: Set BIOS release version

We may as well include the U-Boot release information in the type-0 table
since it is designed for that purpose.

U-Boot uses release versions based on the year and month. The year cannot
fit in a byte, so drop the century.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/lib/smbios.c b/lib/smbios.c
index b1171f5..a072d9e 100644
--- a/lib/smbios.c
+++ b/lib/smbios.c
@@ -143,8 +143,9 @@
 #endif
 	t->bios_characteristics_ext2 = BIOS_CHARACTERISTICS_EXT2_TARGET;
 
-	t->bios_major_release = 0xff;
-	t->bios_minor_release = 0xff;
+	/* bios_major_release has only one byte, so drop century */
+	t->bios_major_release = U_BOOT_VERSION_NUM % 100;
+	t->bios_minor_release = U_BOOT_VERSION_NUM_PATCH;
 	t->ec_major_release = 0xff;
 	t->ec_minor_release = 0xff;