reset: uniphier: add LD11/LD20 stream demux system reset control

Add reset lines for MPEG2 transport stream I/O and demux system (HSC)
on UniPhier LD11/LD20 SoCs.

Signed-off-by: Katsuhiro Suzuki <suzuki.katsuhiro@socionext.com>
Acked-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>