package/libcamera: bump to latest master commit 8a845ab078c3fe12ac4edd16c8cbac5b7ec03b98

This brings in numerous improvements in ipu3 and rpi IPAs as well as
adding support for Black Level Correction, auto gain and auto white
balance algorithms to rkisp IPA. A handful of new camera sensors are
also supported.

Cc: Quentin Schulz <foss+buildroot@0leil.net>
Signed-off-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
Acked-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>