rkdeveloptool: add new command (#12915)

pages/common/rkdeveloptool.md

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+# rkdeveloptool
+
+> Flash, dump, and manage boot firmware for Rockchip-based computer devices.
+> You will need to turn on the device into Maskrom/Bootrom mode before connecting it through USB.
+> Some subcommands may require to run as root.
+> More information: <https://github.com/rockchip-linux/rkdeveloptool>.
+
+- [l]ist all connected Rockchip-based flash [d]evices:
+
+`rkdeveloptool ld`
+
+- Initialize the device by forcing it to [d]ownload and install the [b]ootloader from the specified file:
+
+`rkdeveloptool db {{path/to/bootloader.bin}}`
+
+- [u]pdate the boot[l]oader software with a new one:
+
+`rkdeveloptool ul {{path/to/bootloader.bin}}`
+
+- Write an image to a GPT-formatted flash partition, specifying the initial storage sector (usually `0x0` alias `0`):
+
+`rkdeveloptool wl {{initial_sector}} {{path/to/image.img}}`
+
+- Write to the flash partition by its user-friendly name:
+
+`rkdeveloptool wlx {{partition_name}} {{path/to/image.img}}`
+
+- [r]eset/reboot the [d]evice, exit from the Maskrom/Bootrom mode to boot into the selected flash partition:
+
+`rkdeveloptool rd`