tplink-safeloader: add TL-WPA8631P v3 support

tplink-safeloader: add TL-WPA8631P v3 support

Enable creating images compatible with TP-Link's TL-WPA8631P powerline router.

This matches all current firmwares for all revisions and regions.

Users with older EU "Build 20200314 Rel.3608" & EU "Build 20200508 Rel.41814"
should first upgrade to EU "Build 20200927 Rel.61199" or later before flashing.

The original partition layout is as follows:
    partition fs-uboot base 0x00000 size 0x20000
    partition os-image base 0x20000 size 0x330000
    partition file-system base 0x350000 size 0x3e0000
    partition partition-table base 0x730000 size 0x02000
    partition default-mac base 0x732000 size 0x00020
    partition pin base 0x732100 size 0x00020
    partition device-id base 0x732200 size 0x00030
    partition default-region base 0x732300 size 0x00010
    partition product-info base 0x732400 size 0x00200
    partition extra-para base 0x732600 size 0x00200
    partition soft-version base 0x732800 size 0x00200
    partition support-list base 0x732a00 size 0x00100
    partition profile base 0x732b00 size 0x00100
    partition default-config base 0x732c00 size 0x00800
    partition plc-type base 0x733400 size 0x00020
    partition default-pib base 0x733500 size 0x06000
    partition user-config base 0x740000 size 0x10000
    partition plc-pib base 0x750000 size 0x10000
    partition plc-nvm base 0x760000 size 0x90000
    partition radio base 0x7f0000 size 0x10000

For OpenWrt, the os-image and file-system partition are merged into one
firmware partition, to enable dynamic rootfs partition splits.

Review of partitions in all known firmwares. This patch supports
layout md5sum 0771948573fffa726b8927ca6259ea16.

    filename
    grep -ao "partition .*$" filename | md5sum
    support_list

    wpa8631pv3_eu-up-ver3-0-0-P1-20200314-rel3608.bin
    33df2a8474670e785fb487dc9392dadf
    {product_name:TL-WPA8631P,product_ver:3.0.0,special_id:45550000}

    wpa8631pv3_eu-up-ver3-0-0-P1-20200508-rel41814-APPLC.bin
    68f3408ac2310e81fead071be4238aa9
    {product_name:TL-WPA8631P,product_ver:3.0.0,special_id:45550000}

    wpa8631pv3_us-up-ver3-0-0-P1-20200820-rel39000-APPLC.bin
    0771948573fffa726b8927ca6259ea16
    {product_name:TL-WPA8631P,product_ver:3.0.0,special_id:55530000}

    wpa8631pv3_eu-up-ver3-0-0-P1-20200927-rel61199-APPLC.bin
    0771948573fffa726b8927ca6259ea16
    {product_name:TL-WPA8631P,product_ver:3.0.0,special_id:45550000}

    wpa8631pv3_eu-up-ver3-0-0-P1-20210514-rel45003-APPLC.bin
    0771948573fffa726b8927ca6259ea16
    {product_name:TL-WPA8631P,product_ver:3.0.0,special_id:45550000}

    wpa8631pv3_us-up-ver3-0-0-P1-20210625-rel35759-APPLC.bin
    0771948573fffa726b8927ca6259ea16
    {product_name:TL-WPA8631P,product_ver:3.0.0,special_id:55530000}

    wpa8631pv3_au-up-ver3-0-0-P1-20210625-rel42417-APPLC.bin
    0771948573fffa726b8927ca6259ea16
    {product_name:TL-WPA8631P,product_ver:3.0.0,special_id:41550000}

Signed-off-by: Joe Mullally <jwmullally@gmail.com>
[pepe2k@gmail.com: added 'TL-' prefix in model name, in commit desc]
Signed-off-by: Piotr Dymacz <pepe2k@gmail.com>