Change in flashrom[master]: libflashrom,linux_mtd: add linux_mtd writeprotect support

[Nikolai Artemiev (Code Review)]

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

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

https://review.coreboot.org/c/flashrom/+/61897

to look at the new patch set (#38).

Change subject: libflashrom,linux_mtd: add linux_mtd writeprotect support
......................................................................

libflashrom,linux_mtd: add linux_mtd writeprotect support

This commit adds a generic framework to allow opaque programmers to
implement writeprotect operations and uses the framework to support
writeprotect operations on linux MTD device files.

The generic framework comprises three new functions in
`struct opaque_master` that are called from libflashrom:
- wp_write_cfg()
- wp_read_cfg()
- wp_get_ranges()

For linux_mtd, only the read/write functions are implemented. Linux's
MTD interface doesn't provide a way to get available ranges, so calling
get_wp_ranges() on the linux_mtd master will return
FLASHROM_WP_ERR_RANGE_LIST_UNAVAILABLE.

BUG=b:182223106
BRANCH=none
TEST=WP ops on hana DUT (MT8173) with W25Q32DW flash
TEST=flashrom --wp-enable --wp-range <non-empty> succeeds
TEST=flashrom --wp-enable --wp-range <empty> fails as expected
TEST=flashrom --wp-disable --wp-range <empty> succeeds
TEST=flashrom --wp-disable --wp-range <non-empty> fails as expected
TEST=flashrom --wp-status succeeds

Change-Id: I5c86e28cdec44bec49ba1d36f8ab62241b9b01da
Signed-off-by: Nikolai Artemiev 
---
M libflashrom.c
M linux_mtd.c
M programmer.h
3 files changed, 132 insertions(+), 16 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/97/61897/38