linux-raspberrypi: Enable CONFIG_SQUASHFS

The root filesystem defaults to squashfs.

Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>

meta-ohos-core/recipes-kernel/linux/linux-raspberrypi_%.bbappend

+# SPDX-FileCopyrightText: Huawei Inc.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+FILESEXTRAPATHS_prepend := "${THISDIR}/linux:"
+
+SRC_URI += "file://squashfs.cfg"
+
+# Make rootfstype defined based on ROOT_FSTYPE (selected be wic configuration)
+CMDLINE = "dwc_otg.lpm_enable=0 ${SERIAL} root=/dev/mmcblk0p2 rootfstype=${ROOT_FSTYPE} rootwait ro"