Fix vboot_reference-firmware compilation error when building for coreboot.

When compiling for coreboot the printf format helpers are not
available (they come from the Insyde tree).

The specifier is use in a very limited number of places, it is
probably better to typecast the variable being printed to avoid
compilation errors. This CL accomplishes just that.

BUG=none
TEST=manual:
run the following commands:

emerge-x86-alex -C sys-boot/chromeos-coreboot \
    sys-boot/chromeos-u-boot\
    chromeos-base/vboot_reference \
    chromeos-base/vboot_reference-firmware
emerge-x86-alex chromeos-bootimage

observe the second one succeed.

Change-Id: If19e3a583eb759ba5a21863d1b9b28636c7f00b0
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: http://gerrit.chromium.org/gerrit/4690
1 file changed