flash_fp_mcu: Fix script on nocturne
flash_fp_mcu: Fix script on nocturne

Recently nocturne board switched to 5.10 kernel. It means that SPI
device for nocturne with 5.10 kernel needs to be changed to
/dev/spidev1.0. This change is a good opportunity to get rid of
separate config for nocturne-kernelnext board.

The script still supports nocturne with kernel 4.4 because ChromeOS
images can have this version in other kernel slots.

BUG=b:244171527
BRANCH=None
TEST=Run `flash_fp_mcu --hello` on nocturne and nocturne-kernelnext.

Signed-off-by: Patryk Duda <6aed17a362577cf10cb5675888c1635d522769c1@semihalf.com>
Change-Id: I7c2ecdd5d8ca3d9ce438376bdea33abbaf189e5e
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3861329
Reviewed-by: Tom Hughes <fc5c12f30a5ed2baa0581f44ee14ad1eb7b20d83@chromium.org>
Commit-Queue: Patryk Duda <213d388d1c6ea6afd34b87da9fc4415c3231b04c@google.com>

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