swap_ec_rw: Search for keyset in source tree too

When executing this script outside the SDK from the source tree,
/usr/share/vboot/devkeys (the typical default for --keyset) won't be
available.  Search for the devkeys inside vboot_reference too.

BUG=b:352556657
BRANCH=none
TEST=Script executes outside the SDK

Signed-off-by: Jack Rosenthal <[email protected]>
Change-Id: I1b7c8161acbd1d144208682cb7c035fa5f8d6e8d
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/5757739
Reviewed-by: Yu-Ping Wu <[email protected]>
1 file changed