Change in flashrom[master]: mcp6x_spi.c: Refactor singleton states into reentrant pattern

[Anastasia Klimchuk (Code Review)]

Attention is currently required from: Nico Huber, Edward O'Callaghan, Anastasia Klimchuk.
Hello build bot (Jenkins), Nico Huber, Edward O'Callaghan, Angel Pons,

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

https://review.coreboot.org/c/flashrom/+/54994

to look at the new patch set (#2).

Change subject: mcp6x_spi.c: Refactor singleton states into reentrant pattern
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mcp6x_spi.c: Refactor singleton states into reentrant pattern

Move global singleton states into a struct and store within
the bitbang_spi_master data field for the life-time of the driver.

This patch also drops `mcp6x` and `mcp` prefixes from spi data
struct members.

This is one of the steps on the way to move spi_master data
memory management behind the initialisation API, for more
context see other patches under the same topic "register_master_api".

BUG=b:185191942
TEST=builds

Change-Id: Ia02c1cb9d36fb7b15bb7e09b769d8969c08c2bd5
Signed-off-by: Anastasia Klimchuk 
---
M mcp6x_spi.c
1 file changed, 56 insertions(+), 23 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/94/54994/2