cygnus: add QSPI driver

Hardware / Coreboot - Corneliu Doban [broadcom.com] - 21 April 2015 01:28 UTC

The driver uses the MSPI controller to read/write to/from SPI flash

BUG=chrome-os-partner:35811 BRANCH=boradcom-firmware TEST=bootblock loads and executes verstage

Change-Id: I34c7882170e4f89bee1b6001563c09b16dfea8ca

b048432 cygnus: add QSPI driver
src/mainboard/google/purin/Kconfig | 4 +-
src/soc/broadcom/cygnus/include/soc/addressmap.h | 2 +
src/soc/broadcom/cygnus/spi.c | 294 +++++++++++++++++++++-
3 files changed, 292 insertions(+), 8 deletions(-)

Upstream: review.coreboot.org

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