linux-asahi-{config,source} do not actually provide linux-{config,source}

$ apt-file list linux-source-6.12
linux-source-6.12: /usr/share/doc/linux-source-6.12/changelog.Debian.gz
linux-source-6.12: /usr/share/doc/linux-source-6.12/copyright
linux-source-6.12: /usr/src/linux-source-6.12.tar.xz

$ apt-file list linux-asahi-source-6.12
linux-asahi-source-6.12: /usr/share/doc/linux-asahi-source-6.12/changelog.Debian.gz
linux-asahi-source-6.12: /usr/share/doc/linux-asahi-source-6.12/copyright
linux-asahi-source-6.12: /usr/src/linux-asahi-source-6.12.tar.xz

$ apt-file list linux-config-6.12
linux-config-6.12: /usr/share/doc/linux-config-6.12/changelog.Debian.gz
linux-config-6.12: /usr/share/doc/linux-config-6.12/copyright
linux-config-6.12: /usr/src/linux-config-6.12/config.arm64_none_arm64-16k.xz
linux-config-6.12: /usr/src/linux-config-6.12/config.arm64_none_arm64.xz
linux-config-6.12: /usr/src/linux-config-6.12/config.arm64_none_cloud-arm64.xz
linux-config-6.12: /usr/src/linux-config-6.12/config.arm64_rt_arm64.xz

$ apt-file list linux-asahi-config-6.12
linux-asahi-config-6.12: /usr/share/doc/linux-asahi-config-6.12/changelog.Debian.gz
linux-asahi-config-6.12: /usr/share/doc/linux-asahi-config-6.12/copyright
linux-asahi-config-6.12: /usr/src/linux-config-6.12/config.arm64_none_asahi.xz