host/lib/flashrom: Use flashrom provided in PATH

Remove `/usr/sbin` path prefix from FLASHROM_EXEC_NAME path.
The cbfstool is called this way, so there is no need to have differing
requirements for other utility which needs to be provided anyway.

BUG=b:369294243, b:369290629
BRANCH=None
TEST=m; adb shell crossystem dev_boot_altfw=1

Change-Id: Iff9fcfb8b40287d301bc552487c7fefa804d4a13
Signed-off-by: Jakub Czapiga <[email protected]>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/5890746
Commit-Queue: Julius Werner <[email protected]>
Reviewed-by: Julius Werner <[email protected]>
1 file changed