kconfig: Reintroduce command line argument to check for categories

Commit 6f6cf1e8 ("kconfig check: remove --kconfig-check-{name} args") has removed the ability to check for specific extra categories.

Reintroduce this support by allowing the user to provide a list of categories to check for. For kconfigs from packages, this is in addition to the ones defined in the options in the APKBUILDs.

$ pmbootstrap kconfig check linux-postmarketos-qcom-sc7280 --categories uefi