ipq806x: implement GPIO API

Hardware / Coreboot - Vadim Bendebury [chromium.org] - 23 March 2015 11:20 UTC

Add implementation of the GPIO API defined in src/include/gpiolib.h. Also, clean up the GPIO driver, make it use pointers instead of integers for register address.

This requires a touch in the SPI driver, where the CS GPIO is toggled and in the board function where it enables USB interface.

BUG=chrome-os-partner:30489 TEST=tested with the following patches, observed proto0 properly read the board ID.

Original-Change-Id: I0962947c6bb32a854ca300752d259a48e9e7b4eb

d36ef6a ipq806x: implement GPIO API
src/mainboard/google/storm/mainboard.c | 1 +
src/soc/qualcomm/ipq806x/gpio.c | 97 ++++++++++++++----------------
src/soc/qualcomm/ipq806x/include/gpio.h | 5 +-
src/soc/qualcomm/ipq806x/include/iomap.h | 4 +-
src/soc/qualcomm/ipq806x/spi.c | 4 +-
5 files changed, 53 insertions(+), 58 deletions(-)

Upstream: review.coreboot.org

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