common: avb_verify: rework error/debug prints

Make error prints more verbose with additional context.
Also s/print/debug/g for prints, which might be relevant only
for debugging purposes.

Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Signed-off-by: Igor Opaniuk <igor.opaniuk@gmail.com>
Link: https://lore.kernel.org/r/20240209192045.3961832-4-igor.opaniuk@foundries.io


Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>