/usr/src/linux-gcp-headers-4.18.0-1005/drivers/firmware/ is in linux-gcp-headers-4.18.0-1005 4.18.0-1005.6~18.04.1.
This file is owned by root:root, with mode 0o755.
..
/usr/src/linux-gcp-headers-4.18.0-1005/drivers/firmware/Kconfig
/usr/src/linux-gcp-headers-4.18.0-1005/drivers/firmware/Makefile
/usr/src/linux-gcp-headers-4.18.0-1005/drivers/firmware/arm_scmi/
/usr/src/linux-gcp-headers-4.18.0-1005/drivers/firmware/arm_scmi/Makefile
/usr/src/linux-gcp-headers-4.18.0-1005/drivers/firmware/broadcom/
/usr/src/linux-gcp-headers-4.18.0-1005/drivers/firmware/broadcom/Kconfig
/usr/src/linux-gcp-headers-4.18.0-1005/drivers/firmware/broadcom/Makefile
/usr/src/linux-gcp-headers-4.18.0-1005/drivers/firmware/efi/
/usr/src/linux-gcp-headers-4.18.0-1005/drivers/firmware/efi/Kconfig
/usr/src/linux-gcp-headers-4.18.0-1005/drivers/firmware/efi/Makefile
/usr/src/linux-gcp-headers-4.18.0-1005/drivers/firmware/efi/libstub/
/usr/src/linux-gcp-headers-4.18.0-1005/drivers/firmware/efi/libstub/Makefile
/usr/src/linux-gcp-headers-4.18.0-1005/drivers/firmware/efi/test/
/usr/src/linux-gcp-headers-4.18.0-1005/drivers/firmware/efi/test/Makefile
/usr/src/linux-gcp-headers-4.18.0-1005/drivers/firmware/google/
/usr/src/linux-gcp-headers-4.18.0-1005/drivers/firmware/google/Kconfig
/usr/src/linux-gcp-headers-4.18.0-1005/drivers/firmware/google/Makefile
/usr/src/linux-gcp-headers-4.18.0-1005/drivers/firmware/meson/
/usr/src/linux-gcp-headers-4.18.0-1005/drivers/firmware/meson/Kconfig
/usr/src/linux-gcp-headers-4.18.0-1005/drivers/firmware/meson/Makefile
/usr/src/linux-gcp-headers-4.18.0-1005/drivers/firmware/tegra/
/usr/src/linux-gcp-headers-4.18.0-1005/drivers/firmware/tegra/Kconfig
/usr/src/linux-gcp-headers-4.18.0-1005/drivers/firmware/tegra/Makefile