JZ47XX i2s driver.

This driver is basically the jz4740-i2s.c with few modifications
to make it work with the JZ4780.
Codec driver for the JZ4780.
Audio driver for the MIPS CI20.

This patch adds an ALSA SoC audio driver for the CI20.
DWC2 HCD fix.

This patch was took as is from the ramips target. It fix a problem with the
OTG driver adding device_reset() call.

Signed off by: John Crispin <blogic@openwrt.org>