FP2-262: [OTA]The device reboot looped after OTA update
FP2-262: [OTA]The device reboot looped after OTA update

Because of bootloader verify_signed_bootimg, after generate otapackage,
the boot signed again, so it verify failed. so disable the process of
verifying bootimg in bootloader.

Change-Id: I8ffb6327252744a96552f19a45d75012781d2b68

mozilla-b2g/fairphone2_kernel_lk,mozilla-b2g/fairphone2_kernel_lk,mozilla-b2g/fairphone2_kernel_lk,mozilla-b2g/fairphone2_kernel_lk,mozilla-b2g/fairphone2_kernel_lk