linux_mtd: Mark Opaque chip as tested for WP

Since linux_mtd supports write-protect, its probe function needs
to mark Opaque chip as tested for WP. Programmers which are
opaque masters are responsible for populating flashchip#tested
struct in probe function.

Without the patch, any operation running via linux_mtd displays
a message "This flash part has status UNTESTED for operations: WP".
With the patch, the message is not displayed anymore.

BUG=b:258755442
BRANCH=none
TEST=flashrom -p host on ARM dut
Found Programmer flash chip "Opaque flash chip"
 (8192 kB, Programmer-specific) on host.
No operations were specified.

Original-Change-Id: Icc0521c28555a93f26ce66bdbeaa68590f10c358
Original-Signed-off-by: Anastasia Klimchuk <aklm@chromium.org>
Original-Reviewed-on: https://review.coreboot.org/c/flashrom/+/69518
Original-Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Original-Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
Original-Reviewed-by: Sergii Dmytruk <sergii.dmytruk@3mdeb.com>

Change-Id: I2740e75c974538ddae9f5b17dc4fba9a3101cbb3
Signed-off-by: Felix Singer <felixsinger@posteo.net>
---
M linux_mtd.c
1 file changed, 34 insertions(+), 1 deletion(-)