build_packages: Add missing array expansion

This command is supposed to run `grep` and the array of arguments but
was mistakenly expanding only to the first token.
TEST=`build_packages` no longer shows a grep error

Change-Id: Iaaa1dea7f0a619c13ee9646f40b02112b166ced0
Tested-by: Chris McDonald <>
Reviewed-by: Alex Klein <>
Reviewed-by: Mike Frysinger <>
Commit-Queue: Chris McDonald <>
1 file changed