flash_fp_mcu: Add initial support for strongbad
flash_fp_mcu: Add initial support for strongbad

Caveats
* Need to fix modalias for strongbad
* Need to fix driver binding so that the gpios are not reset
* Need to fix external nrst pull

BRANCH=none
BUG=b:145245345, b:172966748, b:179533783, b:179530529, b:179839337
TEST=emerge-strongbad chromeos-base/ec-utils-test
     cros deploy dut1 chromeos-base/ec-utils-test
     ./flash_fp_mcu custom-strongbad-evt-image.bin

Change-Id: I33d8fee21a2afbf8f5c399e6cb47c2095d833f57
Signed-off-by: Craig Hesling <383db090fd8ef907a606ac8a9eccd2962bc489cf@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2654737
Reviewed-by: Tom Hughes <fc5c12f30a5ed2baa0581f44ee14ad1eb7b20d83@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec