util/lint: Exclude .apcb files from various checks

.apcb files are binary configuration data and not human readable;
exclude them from license, newline, and whitespace checks.

Change-Id: Idc1ddd5067cb97ef8b5758a0b8bf040d1e421871
Signed-off-by: Matt DeVillier <matt.devillier@amd.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79589
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martin.roth@amd.corp-partner.google.com>

util/lint/lint-000-license-headers

@@ -68,6 +68,7 @@ _shipped$|\
 config|\
 cmos\.layout|\
 cmos\.default\
+\.apcb$|\
 "
 
 #space separated list of directories to test