bitbang_spi.c: Rename usages of bitbang_spi_master into master

There were two different things in this file, but both of them were
called "mst" and it was confusing.

Now the variables of type bitbang_spi_master are called "master",
including the member of bitbang_spi_master_data. The variables of
type spi_master are called mst.

BUG=b:185191942
TEST=builds

Change-Id: I2fdbdc2daedde7f6996642cfbb2d34ec06a89621
Signed-off-by: Anastasia Klimchuk <aklm@chromium.org>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/54989
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
1 file changed