Change in flashrom[master]: spi25_statusreg: Allow WRSR_EXT for Status Register 3

[Nico Huber (Code Review)]

Attention is currently required from: Nico Huber, Thomas Heijligen, Nikolai Artemiev, Sergii Dmytruk.
Hello build bot (Jenkins), Thomas Heijligen, Nikolai Artemiev, Sergii Dmytruk,

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

https://review.coreboot.org/c/flashrom/+/64746

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

Change subject: spi25_statusreg: Allow WRSR_EXT for Status Register 3
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spi25_statusreg: Allow WRSR_EXT for Status Register 3

Spansion flash chips S25FL128L and S25FL256L use the WRSR instruction to
write more than 2 registers. So align SR2 and SR3 support: The current
FEATURE_WRSR_EXT is renamed to FEATURE_WRSR_EXT2 and FEATURE_WRSR_EXT3
is added. Also, WRSR3 needs a separate flag now.

Verified that FEATURE_WRSR_EXT2 still works using the `dummy_flasher`.

Signed-off-by: Nico Huber 
Change-Id: Ibdfc6eb3d2cfecbf8da0493d067031ddb079a094
---
M dummyflasher.c
M flashchips.c
M include/flash.h
M include/spi.h
M spi25_statusreg.c
M tests/chip_wp.c
6 files changed, 83 insertions(+), 38 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/46/64746/2