ARM: MXS: introduce stmp device support ...

MXS specific devices have some common infrastructure in the kernel
known as STMP devices. We have the same in barebox, but with a
mxs_ prefix instead of a stmp_ prefix. As some STMP devices are
also found on i.MX6 move the common infrastructure out of MXS
specific files and use the stmp_ prefix.

This is done in preparation for i.MX6 NAND support.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Treewide: remove address of the Free Software Foundation ...

The FSF address has changed in the past. Instead of updating it
each time the address changes, just drop it completely treewide.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM/MXS: the GPIO bitkeeper enable logic is inverse to the pullup enable logic ...

While a set bit enables the pullup (if exists) it disables the bitkeeper (if
exists). Both features are using the same register bit and only one of this
feature is present on a per pin base.

Signed-off-by: Juergen Beisert <jbe@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mxs: Fix support for BITKEEPER() macro ...

There was no check for BE, so any BITKEEPER(1) iomux configurations
were not being applied.

Signed-off-by: Esben Haabendal <esben.haabendal@prevas.dk>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

introduce io.h ...

To allow for some generic io accessors introduce io.h and use
this instead of asm/io.h throughout the tree.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: rename STM arch to mxs ...

We never supported the sigmatel stm chips and probably
never will. So do the first step and rename the architecture
to mxs just like in the kernel.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>