drm/amd: add Kconfig dependency for ACP on DRM_AMDGPU

The DRM_AMD_ACP option doesn't have any dependencies and selects
MFD_CORE, which results in MFD_CORE=y.  Since the code is only called
from DRM_AMDGPU, it should depend on it.  Adding the dependency results
in MFD_CORE being selected as a module again if amdgpu is also a module.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/amd/acp/Kconfig b/drivers/gpu/drm/amd/acp/Kconfig
index ca77ec1..e503e3d 100644
--- a/drivers/gpu/drm/amd/acp/Kconfig
+++ b/drivers/gpu/drm/amd/acp/Kconfig
@@ -2,6 +2,7 @@
 
 config DRM_AMD_ACP
        bool "Enable AMD Audio CoProcessor IP support"
+       depends on DRM_AMDGPU
        select MFD_CORE
        select PM_GENERIC_DOMAINS if PM
        help