Colin McAllister authored Sep 14, 2021 and Stefano Babic committed Sep 15, 2021

Updated the regex to detect placeholders for sha256 checksums in JSON
formatted sw-description files in addition to libconfig formatted files.

Signed-off-by: Colin McAllister <colin.mcallister@garmin.com>
Tested-by: Stefano Babic <sbabic@denx.de>