Convert mmchs to new driver interface.

Signed-off-by: Gerd Zellweger <mail@gerdzellweger.com>

MMCHS driver for OMAP4 platform.

Simple driver that can read and write blocks one-at-the-time
on a SDHC card on the pandaboard. We currently don't support SD or MMC cards.
The code was written to for the AOS course at ETH.

Also contains an implementation for the ata_rw28 interface to work with the VFS
FAT implementation.

Use of sysctrl_padconf_core mackerel file instead of ctrlmod in ctrlmod.c.

Added user-level interrupts for mmchs driver.

Make sure mmchs driver compiles again in user space & changed map_device_register API call slightly.

Interrupt acknowledge and enable methods are currently commented out and need to be reenabled once we have working interrupts.

MMCHS and I2C code imported into main tree right now as a kernel-space library.

Needs to be changed to a user space driver.