util/chromeos/crosfirmware.sh: Add 7z as a dependency

Many newer ChromeOS recovery shellballs require 7z to decompress, so
add it as a dependency.

Change-Id: Ibe0391567736a39c31914c573b154d8ed7de617b
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/90786
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Sean Rhodes <sean@starlabs.systems>

util/chromeos/crosfirmware.sh

@@ -13,6 +13,7 @@ exit_if_dependencies_are_missing() {
 		["parted"]="parted"
 		["curl"]="curl"
 		["unzip"]="unzip"
+		["7z"]="p7zip"
 	)
 
 	# Check all dependencies at once