board/arcturus/aarch64-ucls1012a: bump u-boot and kernel version

- Bump Linux to version 5.4.137
- Bump U-Boot to add new targets, version remains the same
- Drop BR2_ROOTFS_OVERLAY and remove S09modload script because it was
  only used by PFE and now PFE is loaded directly by the kernel
- Use Image.gz instead of Image to have a compressed kernel
- Rename ucls1012a.its to br2-ucls1012a.its since post-build.sh and
  post-image.sh use different name. This fixes the bug that didn't
  allow the creation of the part0-000000.itb file.

Signed-off-by: Oleksandr Zhadan <oleks@arcturusnetworks.com>
Signed-off-by: Michael Durrant <mdurrant@arcturusnetworks.com>
Reviewed-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
Tested-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

board/arcturus/aarch64-ucls1012a/post-build.sh

@@ -1,5 +1,4 @@
 #!/bin/sh
 
 mkdir -p ${TARGET_DIR}/lib/firmware
-cp -f ${BUILD_DIR}/linux-custom/firmware/ppfe/* ${TARGET_DIR}/lib/firmware/
 cp -f ${BUILD_DIR}/linux-custom/br2-ucls1012a.its ${BINARIES_DIR}/

board/arcturus/aarch64-ucls1012a/readme.txt

@@ -24,13 +24,13 @@ After building, you should obtain this tree:
 
     output/images/
     +-- arc-ucls1012a.dtb
-    +-- Image
+    +-- Image.gz
     +-- part0-000000.itb
     +-- rootfs.cpio
     +-- rootfs.cpio.gz
     +-- rootfs.tar
     +-- u-boot.bin
-    +-- ucls1012a.its
+    +-- br2-ucls1012a.its
 
 Flashing
 --------

board/arcturus/aarch64-ucls1012a/rootfs_overlay/etc/init.d/S09modload

@@ -1,14 +0,0 @@
-#!/bin/sh
-#
-case "$1" in
-       start)
-                modprobe pfe
-                ;;
-        stop)
-                ;;
-        restart|reload)
-                ;;
-        *)
-                echo "Usage: $0 {start|stop|restart}"
-                exit 1
-esac