cros-build: add support for jacuzzi

Add the jacuzzi environment and build script to build the
firmware-jacuzzi-R81-12871.B-collabora Depthcharge branch.
Signed-off-by: Mylène Josserand <mylene.josserand@collabora.com>

cros-build/.gitattributes

 firmware/image-coral-R64-10068.111.0.serial-rcn.bin filter=lfs diff=lfs merge=lfs -text
 firmware/image-grunt-R71-11031.104.0.serial-collabora-20201030.bin filter=lfs diff=lfs merge=lfs -text
 firmware/image-bobba-R72-11297.144.0-octopus.serial-collabora-20201104.bin filter=lfs diff=lfs merge=lfs -text
+firmware/image-jacuzzi-R81-12871.B.dev-collabora-20210204.bin filter=lfs diff=lfs merge=lfs -text

cros-build/firmware/jacuzzi.bin

+image-jacuzzi-R81-12871.B.dev-collabora-20210204.bin
\ No newline at end of file

cros-build/setup/jacuzzi.env

+CROS_DEVICE=jacuzzi
+CROS_SDK_BRANCH=release-R81-12871.B

cros-build/setup/jacuzzi.sh

+#!/bin/bash
+
+set -e
+
+export ACCEPT_LICENSE=Google-TOS
+export BOARD=jacuzzi
+
+cmd_setup() {
+    setup_board --board=$BOARD
+}
+
+cmd_checkout() {
+    echo "board: ${BOARD}"
+    cros_workon --board ${BOARD} start depthcharge
+    cd ../platform/depthcharge
+    git fetch \
+        https://gitlab.collabora.com/chromium/depthcharge.git \
+        firmware-jacuzzi-R81-12871.B-collabora
+    git checkout FETCH_HEAD
+    cd -
+}
+
+cmd_build() {
+    emerge-${BOARD} chromeos-bootimage
+    cp /build/jacuzzi/firmware/image-${BOARD}.dev.bin firmware/${BOARD}-new.bin
+}
+
+cmd_$1
+
+exit 0