i.MX23: Add USB (phy) support ...

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

ARM STM/i.MX: Add a pixel clock calculation routine for i.MX23/i.MX28 ...

In order to support video graphics output on i.MX23/i.MX28 based platforms,
a calculation routine for the pixel clock is required.

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

STM378x: Add i.MX28 architecture ...

The i.MX28 shares a lot of functionality with its predecessor, the
i.MX23 (formerly known as stm378x). This patch adds some files to support
both CPUs.

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

Add the basic files for the i.MX23/i.MX28 familiy of CPUs ...

These CPUs are called "i.MX", but they are of type STM378x from SigmaTel. They
do not share any devices with the other i.MX CPUs, so we need a separate
architecute directory to handle them without an ifdef hell in the native i.MX
files.

Signed-off-by: Juergen Beisert <jbe@pengutronix.de>