Change in coreboot[master]: drivers/spi: Define spi_flash_ctrlr structure

[Furquan Shaikh (Code Review)]

Hello Aaron Durbin, Julius Werner, build bot (Jenkins),

I'd like you to reexamine a change.  Please visit

https://review.coreboot.org/19708

to look at the new patch set (#11).

Change subject: drivers/spi: Define spi_flash_ctrlr structure
......................................................................

drivers/spi: Define spi_flash_ctrlr structure

In order to support some specialized SPI controllers that are actually
SPI flash controllers, define a new spi_flash_ctrlr structure with the
following member:

1. probe: Specialized probe function provided by the spi flash
controller.

With this change, the specialized spi flash probe functions are now
associated with a particular spi ctrlr structure and no longer
disconnected from the spi controller.

Later, more functions will be added to spi_flash_ctrlr.

BUG=b:38330715
TEST=Verified with the entire patch series that spi flash driver still
works fine on poppy.

Change-Id: I35f3bd8ddc5e71515df3ef0c1c4b1a68ee56bf4b
Signed-off-by: Furquan Shaikh 
---
M src/drivers/spi/spi_flash.c
M src/include/spi-generic.h
M src/include/spi_flash.h
M src/soc/intel/apollolake/spi.c
M src/soc/intel/common/block/fast_spi/fast_spi.c
M src/soc/intel/common/block/fast_spi/fast_spi_flash.c
M src/soc/intel/common/block/include/intelblocks/fast_spi.h
M src/soc/intel/skylake/spi.c
M src/soc/mediatek/mt8173/flash_controller.c
M src/soc/mediatek/mt8173/spi.c
M src/southbridge/intel/common/spi.c
11 files changed, 81 insertions(+), 68 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/08/19708/11