mmc-utils: Change the printing format of eMMC FW version

Currently, the printing format of eMMC firmware version
is char, That format will cause the 'eMMC Firmware
Version' of storage_info.txt to print the messy code.
This change can fix this issue.

BUG=b:172629974
TEST=emerge-zork or emerge-dedede sys-apps/mmc-utils and
cros deploy to DUT,check that the storage_info.txt do not
have any messy code.

Change-Id: I41ddb6a3bf2d693f91b8b1208abc292f10c6ad9e
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/mmc-utils/+/2605918
Tested-by: Xingyu Wu <wuxy20@lenovo.corp-partner.google.com>
Reviewed-by: Gwendal Grignou <gwendal@chromium.org>
Commit-Queue: Gwendal Grignou <gwendal@chromium.org>
1 file changed