raiden_debug_spi: add param for a custom reset setup

The default Cr50 behavior is to assert EC_RST_L before programming the
AP. Some Chromium devices don't power the AP flash when the EC is in
reset. These boards can't flash the AP with the current CCD behavior.
This change adds a custom_rst raiden_debug param to tell Cr50 not to
assert EC_RST_L or touch any reset signals while flashing the AP. Users
will need to configure the reset signals before running the flashrom
command.

BUG=b:154885210
BRANCH=none
TEST=manual

	flashrom -p raiden_debug:target=EC -r ec.bin

	flashrom -p raiden_debug:target=AP -r ap.bin

	flashrom -p raiden_debug:target=AP,custom_rst=true -r ap.bin

	flashrom -p raiden_debug:target=AP,custom_rst=inv -r ap.bin

	flashrom -p raiden_debug -r base.bin

Signed-off-by: Mary Ruthven <mruthven@chromium.org>
Change-Id: I2da26469120c5304bc129b5578fcb7ca805fc1d1
---
M raiden_debug_spi.c
1 file changed, 30 insertions(+), 12 deletions(-)