build_sdk_board: run emerge with --verbose

This provides USE flag info which can be helpful when looking at SDK logs.

BUG=chromium:1169469
TEST=CQ passes

Change-Id: I8323dc9c7e818928763666bef14995fa3ae88647
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/2643860
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Manoj Gupta <manojgupta@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Auto-Submit: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
1 file changed