drm/amd/display: Add missing SDP registers to DCN32 reglist

[Why]
Certain features require the additional DP SDP configuration registers
DP_SEC_CNTL1 and DP_SEC_CNTL5 in order to function correctly.

The DCN32 DIO stream encoder reglist is currently missing these two
registers.

[How]
Add the missing registers to the DCN32 DIO stream encoder reglist.

Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: George Shen <George.Shen@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>