FIRSBOOT: add extra p5 for ROMS (use GPT) & add option for switching FS (#168)

* BOARD: firstboot:  use ext4 for p1 explicitly
* BOARD: /etc/main : update fsck scripts
* BOARD: inittab: 
 - add /roms in p5
 - mount RO /boot in async (default)
* BOARD: genimage.sh: gen ROMS EXT4 image
* BAORD: prebuild.sh: 
 - create mount point for ROMS
 - increase MAIN & ROMS block size
 - the size of /mnt is "hardcoded" after image creation
 - we need real space for backup manipulation in ROMS
* BOARD: mv roms upward
* BOARD: firstboot: add p5 ROMS and resize
* BOARD: genimage-sdcard.cfg: 
 - use GPT
 - add p5 for roms

* PACKAGE/BOARD: patch/genimage: down-size gpt table
* PACKAGE/DEFCONFIG: add `gptfdisk` package to shared
* BOARD: firstboot: allow for switching FS type in MAIN and ROMS
* README: update firstboot_procedure.drawio.png
  - add FS change boxes and IPK installer
* BOARD: firstboot: not mandatory to resize for IPK manager
* DEFCONFIG: add default kernel patching
* DEFCONFIG: uppercase rootfs label
* BOARD: umtpr: uppercas partition LABELS
* DEFCONFIG/PACKAGE: add RSYNC pkg
* BOARD: mount FAT p5 in async (default)

* BOARD: add ROMS icons for Win
Co-Authored-By: TriForce <triforce@gznetwork.com>

.github/workflows/build.yml

@@ -106,7 +106,7 @@ jobs:
     - uses: actions/upload-artifact@v4
       with:
         name: rootfs (uClibc)
-        path: ${{ inputs.submodule || '.' }}/output/images/rootfs.btrfs
+        path: ${{ inputs.submodule || '.' }}/output/images/rootfs.ext4
         if-no-files-found: error # 'error', 'warn', 'ignore'; defaults to `warn`   
 
   build-image-musl:
@@ -198,7 +198,7 @@ jobs:
     - uses: actions/upload-artifact@v4
       with:
         name: rootfs (musl)
-        path: ${{ inputs.submodule || '.' }}/output/images/rootfs.btrfs
+        path: ${{ inputs.submodule || '.' }}/output/images/rootfs.ext4
         if-no-files-found: error # 'error', 'warn', 'ignore'; defaults to `warn` 
 
   build-sdk-uclibc-static: