ARM: imx/mx27_3ds: Add PMIC support

MX27_3DS board has a MC13783 PMIC connected to the CSPI2 port.

Add support for the PMIC.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>