ohci-nxp: Driver cleanup

Cleanup for ohci-nxp.c:

* Cleanup of resource handling (mem and irq), use devm_request_and_ioremap()
* Use DMA_BIT_MASK()
* Don't remove __devinit
* Removed obsolete gpio.h include
* More consistent bit access symbols
* Removed unused extern declaration ocpi_enable()
* Added error handling on i2c_get_adapter()
* Whitespace cleanup

Signed-off-by: Roland Stigge <stigge@antcom.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>