Inverse gamma correction blocks (IGC) are not used today so lets
remove the usage of DPU_DSPP_IGC in the dspp flush to make it easier
to remove IGC from the catalog.
We can add this back when IGC is properly supported in DPU with
one of the standard DRM properties.
Signed-off-by: Abhinav Kumar <quic_abhinavk@xxxxxxxxxxx>