dvb/si: Complete support for descriptor 0x43 (Satellite delivery).
dvb/si: Complete support for descriptor 0x43 (Satellite delivery).

Add missing init and set functions and also fix return type of
desc43_get_modulation() function.

avble/bitstream,theambient/bitstream_c,hiroshiyui/bitstream,gfto/bitstream,hiroshiyui/bitstream,svogl/bitstream,kgmoore/bitstream,kierank/bitstream,svogl/bitstream,gfto/bitstream,kgmoore/bitstream,hiroshiyui/bitstream,kierank/bitstream,kgmoore/bitstream,avble/bitstream,theambient/bitstream_c,avble/bitstream,svogl/bitstream