MIPS: JZ4770: DMA: Introduced enums similar to JZ4740
MIPS: JZ4770: Removed definitions for UART4

It is doubtful this UART really exists; it is not listed in the
hardware docs.
Revert "USB: host: OHCI: Add JZ4770 support from Ingenic"

This reverts commit 3913e2b2159436d90beef5fe3daeaf4a8c9bd524.

We'll be using the JZ4740 driver instead.
MIPS: JZ4770: Toggle USBPCR1_UHC_POWON in cpm_uhc_phy() as well

There is a UHC PHY disable bit and a PHY power-on bit, both have to be
flipped for the PHY to be usable. So it makes sense to do both inside
this same function.
USB: ohci-jz4740: Add support for JZ4770

The JZ4770 has additional control bits in the CPM to disable the UHC
PHY when it's not in use. These are in the disabled state at boot, so
we must enable them before we can use the UHC.
MIPS: JZ4770: Switch platform to use ohci-jz4740 driver