Those functions are all unused and some not even implemented.

v2: keep cgs_get_pci_resource, it is used by the ACP driver.
Signed-off-by: NChristian König <christian.koenig@amd.com>
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>