Attention is currently required from: Nico Huber, Angel Pons, Nikolai Artemiev, Anastasia Klimchuk.

Nikolai Artemiev uploaded patch set #36 to this change.

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libflashrom,linux_mtd: add linux_mtd writeprotect support

This commit adds a generic framework to allow opaque programmers to
implement writeprotect operations and uses it 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 <nartemiev@google.com>
---
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/97/61897/36

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