wip: add binderfs systemd mount unit and symlinks creation

TODO: set the correct permissions (0666) to binder devices otherwise 
this is not working

Signed-off-by: Francesco Pham <francesco.pham@huawei.com>

recipes-openharmony/openharmony/files/dev-binderfs.mount

+[Unit]
+Description=/dev/binderfs mount
+ConditionCapability=CAP_SYS_ADMIN
+
+[Mount]
+What=binder
+Where=/dev/binderfs
+Type=binder
\ No newline at end of file

recipes-openharmony/openharmony/files/openharmony-preinit.service

 [Unit]
 Description=OpenHarmony pre-init setup
+Wants=param.service
+After=param.service
+RequiresMountsFor=/dev/binderfs
+After=dev-binderfs.mount
 
 [Service]
 Type=oneshot
+ExecStartPre=/bin/sh -c 'ln -fs /dev/binderfs/* /dev/'
 ExecStart=/bin/sh /usr/sbin/openharmony-preinit
 RemainAfterExit=yes
 

recipes-openharmony/openharmony/openharmony-standard_3.0.bb

@@ -408,17 +408,22 @@ SYSTEMD_AUTO_ENABLE = "enable"
 # Used to create folders needed by OH services and components
 PACKAGES =+ "${PN}-openharmony-preinit"
 SYSTEMD_PACKAGES = "${PN}-openharmony-preinit"
-SYSTEMD_SERVICE:${PN}-openharmony-preinit = "openharmony-preinit.service"
+SYSTEMD_SERVICE:${PN}-openharmony-preinit = "openharmony-preinit.service dev-binderfs.mount"
 FILES:${PN}-openharmony-preinit = " \
     ${libdir}/openharmony-preinit \
 "
-SRC_URI += "file://openharmony-preinit file://openharmony-preinit.service"
+SRC_URI += "\
+    file://openharmony-preinit \
+    file://openharmony-preinit.service \
+    file://dev-binderfs.mount \
+"
 do_install:append() {
     install -d ${D}/${sbindir}
     install -m 755 ${WORKDIR}/openharmony-preinit ${D}/${sbindir}
 
     install -d ${D}/${systemd_unitdir}/system
     install -m 644 ${WORKDIR}/openharmony-preinit.service ${D}${systemd_unitdir}/system/
+    install -m 644 ${WORKDIR}/dev-binderfs.mount ${D}${systemd_unitdir}/system/
 }
 RDEPENDS:${PN} += "${PN}-openharmony-preinit"