omap_hsmmc: Move gpio and regulator control from board file

This patch moves the setup code for GPIO's and Voltage
Regulators from the board file mmc-twl4030.c to the
driver omap_hsmmc.c.  PBIAS and other system control
configuration remains in the board file.

Moving GPIO code to the driver makes the board initialisation
code independent of when GPIO's are defined.  That makes the
board initialisation now entirely independent of its original
twl4030 roots.

Moving Voltage Regulator code to the driver allows for further
development of regulator support in the core MMC code.  It also
permits the MMC core to be compiled as a module, because the
board code no longer calls MMC core functions.

Signed-off-by: Adrian Hunter <adrian.hunter@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/configs/rx51_defconfig

@@ -1354,15 +1354,15 @@ CONFIG_USB_OTG_UTILS=y
 # CONFIG_USB_GPIO_VBUS is not set
 # CONFIG_ISP1301_OMAP is not set
 CONFIG_TWL4030_USB=y
-CONFIG_MMC=y
+CONFIG_MMC=m
 # CONFIG_MMC_DEBUG is not set
 # CONFIG_MMC_UNSAFE_RESUME is not set
 
 #
 # MMC/SD/SDIO Card Drivers
 #
 CONFIG_MMC_BLOCK=m
-CONFIG_MMC_BLOCK_BOUNCE=y
+# CONFIG_MMC_BLOCK_BOUNCE is not set
 # CONFIG_SDIO_UART is not set
 # CONFIG_MMC_TEST is not set