MIPS: JZ4750D: Properly define serial8250 uart

MIPS: JZ4750D: Fix compilation for serial8250
MIPS: JZ4750D: Cleanup MMC0 and MMC1 definitions
MIPS: JZ4750D: Move jz_mmc_platform_data to jz4750d_mmc.h

MIPS: JZ4750D: Fix jz4750d_mmc.h
mmc: JZ4750D: Cleanup the driver and make it use clocks

mmc: JZ4750D: Fix compilation
Revert "Patch serial 8250 driver for JZSOC"

This reverts commit 58aac66190554d6aa0af960f39bccbfe89ca5310.
MIPS: JZ4750D: Remove early serial init leftovers from setup.c
MIPS: JZ4750D: Remove absurd mixer device from board code