i.MX23 currently uses kHz as the unit for its clock handling and calculation
to avoid overflows when calculation with the internal 480 MHz PLL and its
fractional divider. This patch changes all routines to accept Hz and deliver
Hz as the clock unit.

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

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

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>