qdl: Allow skipping the firehose step by omitting xml files

[jerry-skydio]

Sometimes it is useful to run only the sahara step without running
firehose. Allow that by detecting if no xml files are passed.

This is mainly useful to mix and match qdl with stock tools like
QSaharaServer and fh_loader, in case some combination of these
behaves better for a given device.

Signed-off-by: Jerry Zhang Jerry@skydio.com

[jerry-skydio]

Reviews in this chain:
└#170 qdl: Allow skipping the firehose step by omitting xml files

[jerry-skydio]

#	head	base	diff	date	summary
0	23ae1524	b4030fab	diff	Dec 17 13:21 PM	1 file changed, 9 insertions(+), 6 deletions(-)

[andersson]

I think we need to combine this feature with the support for then running qdl again, while the device is already in Firehose state.

[quic-kdybcio]

Isn't this what ks ("kickstart") already achieves though?