mc_tcu3: Enable auto generated attributes in cbfs

Use CBFS_AUTOGEN_ATTRIBUTES for mc_tcu3 to enable position
and alignment attributes in cbfs.

Change-Id: I6c39bb02ab641d7e22e20e77a72a577f159549dd
Signed-off-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-on: https://review.coreboot.org/13123
Tested-by: build bot (Jenkins)
Reviewed-by: Mario Scheithauer <mario.scheithauer@siemens.com>

src/mainboard/siemens/mc_tcu3/Kconfig

@@ -28,6 +28,7 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	select DRIVER_INTEL_I210
 	select SOC_INTEL_FSP_BAYTRAIL_MD
 	select USE_BLOBS
+	select CBFS_AUTOGEN_ATTRIBUTES
 
 config MAINBOARD_DIR
 	string