drm/amd/pp: Clean up header file include

smu7_smumgr.h should not be included in rv and vega, The common functions
for all smu7 asics are put in smu_smumgr.c.

Not include cgs interface in smumgr.c. the code used cgs interface has been
deleted.

Not include smu_ucode_xfer_vi.h in rv/vega

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Rex Zhu <Rex.Zhu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>