ath79: support for TP-Link EAP225 v3

TP-Link EAP225 v3 is an AC1350 (802.11ac Wave-2) ceiling mount access
point. Serial port access for debricking requires fine soldering.

Device specifications:
* SoC: QCA9563 @ 775MHz
* RAM: 128MiB DDR2
* Flash: 16MiB SPI-NOR
* Wireless 2.4GHz (SoC): b/g/n, 3x3
* Wireless 5Ghz (QCA9886): a/n/ac, 2x2 MU-MINO
* Ethernet (AR8033): 1× 1GbE, 802.3at PoE

Flashing instructions:
* ssh into target device and run `cliclientd stopcs`
* Upgrade with factory image via web interface

Debricking:
* Serial port can be soldered on PCB J3 (1: TXD, 2: RXD, 3: GND, 4: VCC)
    * Bridge unpopulated resistors R225 (TXD) and R237 (RXD).
      Do NOT bridge R230.
    * Use 3.3V, 115200 baud, 8n1
* Interrupt bootloader by holding CTRL+B during boot
* tftp initramfs to flash via LuCI web interface
    setenv ipaddr 192.168.1.1 # default, change as required
    setenv serverip 192.168.1.10 # default, change as required
    tftp 0x80800000 initramfs.bin
    bootelf $fileaddr

MAC addresses:
MAC address (as on device label) is stored in device info partition at
an offset of 8 bytes. ath9k device has same address as ethernet, ath10k
uses address incremented by 1.
From OEM boot log:

    Using interface ath0 with hwaddr b0:...:3e and ssid "..."
    Using interface ath10 with hwaddr b0:...:3f and ssid "..."

Tested by forum user blinkstar88

Signed-off-by: Sander Vanheule <sander@svanheule.net>

tools/firmware-utils/src/tplink-safeloader.c

@@ -1327,6 +1327,35 @@ static struct device_info boards[] = {
 		.last_sysupgrade_partition = "file-system"
 	},
 
+	/** Firmware layout for the EAP225 v3 */
+	{
+		.id     = "EAP225-V3",
+		.support_list =
+			"SupportList:\r\n"
+			"EAP225(TP-Link|UN|AC1350-D):3.0\r\n",
+		.support_trail = '\xff',
+		.soft_ver = NULL,
+		.soft_ver_compat_level = 1,
+
+		.partitions = {
+			{"fs-uboot", 0x00000, 0x20000},
+			{"partition-table", 0x20000, 0x02000},
+			{"default-mac", 0x30000, 0x01000},
+			{"support-list", 0x31000, 0x00100},
+			{"product-info", 0x31100, 0x00400},
+			{"soft-version", 0x32000, 0x00100},
+			{"firmware", 0x40000, 0xd80000},
+			{"user-config", 0xdc0000, 0x30000},
+			{"mutil-log", 0xf30000, 0x80000},
+			{"oops", 0xfb0000, 0x40000},
+			{"radio", 0xff0000, 0x10000},
+			{NULL, 0, 0}
+		},
+
+		.first_sysupgrade_partition = "os-image",
+		.last_sysupgrade_partition = "file-system"
+	},
+
 	/** Firmware layout for the EAP225-Wall v2 */
 	{
 		.id     = "EAP225-WALL-V2",