image: respect DEFAULT and BROKEN when Default profile is selected

image: respect DEFAULT and BROKEN when Default profile is selected

Currently, when you select the Default profile it does not honor DEFAULT:=n
nor BROKEN:=y in device profiles but rather just tries to build all of them.

This may work when building directly, but when using Image Builder it will
always fail since no kernel or anything else is present for devices that
have DEFAULT:=n or BROKEN:=Y set since those are skipped during build.

So, lets look for DEFAULT being set to "n" or BROKEN being set to "y" and
then remove clear _PROFILE_SET so they dont end up being marked for
installation.

Fixes: #18410
Link: https://github.com/openwrt/openwrt/pull/18814
Signed-off-by: Robert Marko <robimarko@gmail.com>