community/ima-evm-utils: add attr to checkdepends

Fix ima_hash, sign_verify and fsverity tests failing due to missing getfattr. Error found during rebuild on a 3.21 builder.

Example error:

ERROR: ima_hash
===============

evmctl is ../src/evmctl
openssl is /usr/bin/openssl
./functions.sh: line 36: type: getfattr: not found
getfattr is required for test
ERROR ima_hash.test (exit status: 99)