dvb/si: Complete support for descriptor 0x5f (Private data specifier).
dvb/si: Complete support for descriptor 0x5f (Private data specifier).

Add missing desc5f_set_specifier() function and also print the specifier
as hex.

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