Update DG2 init bw info similar to other platforms even though
DG2 has constant bandwidh. This will avoid branching out DG2
specific max bw calls.

V3: Fix dg2_get_bw_info() and avoid handle special cases
    for DG2 (Ville Syrjälä)

cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
cc: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Signed-off-by: Vinod Govindapillai <vinod.govindapillai@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220328230000.215094-1-vinod.govindapillai@intel.com