Use globbing to fetch mac_permissions.xml.
Use globbing to fetch mac_permissions.xml.

Android master puts that file at a different location, so use similar
logic to official signing script.

TEST="sign_android_image.sh passed locally for both caroline (NYC) &
caroline-bertha (master)."
BUG=b:65610114
BRANCH=none

Change-Id: If33bfbcaa7e6cff95f26ff26a91735c87880f3db
Reviewed-on: https://chromium-review.googlesource.com/686046
Commit-Ready: Garfield Tan <ed322fb4646a0a21940aa87053633a77a65c745e@chromium.org>
Tested-by: Garfield Tan <ed322fb4646a0a21940aa87053633a77a65c745e@chromium.org>
Reviewed-by: Victor Hsieh <e50b749460aecb2d84d38a0c40b84707be8ae902@chromium.org>
Reviewed-by: Mike Frysinger <8f3f75c74bd5184edcfa6534cab3c13a00a2f794@chromium.org>

coreboot/vboot,coreboot/vboot,coreboot/vboot,coreboot/vboot,coreboot/vboot