Change in flashrom[master]: spi_master: Use new API to register shutdown function

[Anastasia Klimchuk (Code Review)]

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

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

https://review.coreboot.org/c/flashrom/+/56103

to look at the new patch set (#7).

Change subject: spi_master: Use new API to register shutdown function
......................................................................

spi_master: Use new API to register shutdown function

This allows spi masters to register shutdown function in spi_master
struct, which means there is no need to call register_shutdown in init
function, since this call is now a part of register_spi_master.

As a consequence of using new API, two things are happening here:
1) No resource leakage anymore in case register_shutdown() would fail,
2) Fixed propagation of register_spi_master() return values.

Basic testing: when I comment out free(data) in linux_spi_shutdown, test
fails with error
../linux_spi.c:235: note: block 0x55a4db276510 allocated here
ERROR: linux_spi_init_and_shutdown_test_success leaked 1 block(s)
Means, shutdown function is invoked.

BUG=b:185191942
TEST= 1) builds and ninja test including CB:56911
2) On ARMv7 device
flashrom -p linux_spi -V
-> using linux_spi, chip found
3) On x86_64 AMD device
flashrom -p internal -V
-> this is actually using sb600spi, chip found

Change-Id: Ib60300f9ddb295a255d5ef3f8da0e07064207140
Signed-off-by: Anastasia Klimchuk 
---
M bitbang_spi.c
M buspirate_spi.c
M ch341a_spi.c
M dediprog.c
M digilent_spi.c
M ene_lpc.c
M ft2232_spi.c
M it85spi.c
M it87spi.c
M jlink_spi.c
M linux_spi.c
M lspcon_i2c_spi.c
M mec1308.c
M mstarddc_spi.c
M ni845x_spi.c
M pickit2_spi.c
M realtek_mst_i2c_spi.c
M sb600spi.c
M stlinkv3_spi.c
M usbblaster_spi.c
M wbsio_spi.c
21 files changed, 40 insertions(+), 112 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/03/56103/7