brcm47xx: extend firmware validation
This provides TRX validation result, so final JSON may look like:
{
"tests": {
"fwtool_signature": true,
"fwtool_device_match": true,
"trx_valid": true
},
"valid": true,
"forceable": true
}
It also prevents users from installing broken firmware files, e.g.:
root@OpenWrt:/# sysupgrade -F -n /tmp/TZ
Image metadata not found
Invalid image type. Please use firmware specific for this device.
Image check failed but --force given - will update anyway!
Commencing upgrade. Closing all shell sessions.
Firmware image is broken and cannot be installed
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>