V4L/DVB (7862): Add mxl5505s driver for MaxiLinear 5505 chipsets

Initial check-in of the original driver to establish history.
Signed-off-by: NChia-Ling Lu Developer <chialing@realtek.com.tw>
Signed-off-by: NSteven Toth <stoth@hauppauge.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>