pnp_device: improve readability

Add comments on the ops handling in pnp_enable_devices function and the
pnp_info struct.

Also remove the negation in the check if an LDN-specific override is used.
This patch doesn't change the logic though.

Change-Id: I3e80dbce1f29ee3e95e3b1d71c9b8479561d5c1a
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-on: https://review.coreboot.org/27384
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
2 files changed