HACK: genio: write_uboot_platform() no-op

- this is tricky, as during image build we can't write it anywhere,
  but we want to write to UFS's 2nd LUN during board-side `armbian-install`

Author: rpardini

config/sources/families/genio.conf

@@ -278,3 +278,7 @@ function add_host_dependencies__genio_python3_deps_for_optee_build() {
 	display_alert "Preparing Genio OPTEE host-side dependencies" "${EXTENSION}" "info"
 	declare -g EXTRA_BUILD_DEPS="${EXTRA_BUILD_DEPS} python3-cryptography python3-pyelftools"
 }
+
+function write_uboot_platform() {
+	: # noop
+}