ddr: fsl: move fsl_ddr_set_memctl_regs prototype to include/ ...

fsl_ddr_set_memctl_regs() is not only used internally in the DDR
controller driver, but can also be called by the boards to configure
a static setting. Move the prototype to include/ where it can be
used by board code.

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

ddr: fsl: Add Freescale ddr driver ...

This adds the Freescale ddr driver used on various PowerPC and
Layerscape SoCs. This is based on U-Boot-2019.01 but with many
adjustments:

- PowerPC support has been removed
- CPP #ifdeffery replaced with C
- No more global variables/functions expected from the driver,
  configuration is passed by the board code which calls the driver

We already have the driver in the tree in an older version forked from
U-Boot-2013.04. This version lacks Layerscape support and many quirks
in the driver are PowerPC specific. Since the existing driver should
work on all known PowerPC and PowerPC is a dead end I decided not to
improve the existing driver and instead add a new Layerscape specific
driver.

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