uek-rpm: Remove unused filter-arch.sh scripts from UEK source

filter-x86_64.sh and filter-aarch64.sh are not used anywhere in the
newer packaging model that UEK8 uses, get rid of these files from the
source.

Orabug: 37453041

Signed-off-by: Harshit Mogalapalli <[email protected]>
Reviewed-by: Jack Vogel <[email protected]>

Author: harshimogalapalli