ath79: add support for PISEN TS-D084

PISEN TS-D084 is an wireless router with a battery and integrated power
supply based on Atheros AR9331.

Specification:

- 400/400/200 MHz (CPU/DDR/AHB)
- 64 MB of RAM (DDR2)
- 8 MB of FLASH (SPI NOR)
- 1x 10/100 Mbps Ethernet
- 1T1R 2.4 GHz (AR9331)
- 1x USB 2.0

Flash instruction:
 Upload generated factory image through web interface.

Signed-off-by: xixiao zheng <xixiaozheng64@gmail.com>
[wrap commit message, add flash instruction]
Signed-off-by: Chuanhong Guo <gch981213@gmail.com>

target/linux/ath79/image/generic.mk

@@ -1,5 +1,6 @@
 include ./common-buffalo.mk
 include ./common-netgear.mk
+include ./common-tp-link.mk
 
 DEVICE_VARS += ADDPATTERN_ID ADDPATTERN_VERSION
 DEVICE_VARS += SEAMA_SIGNATURE SEAMA_MTDBLOCK
@@ -817,6 +818,16 @@ define Device/netgear_wndr3700v2
 endef
 TARGET_DEVICES += netgear_wndr3700v2
 
+define Device/pisen_ts-d084
+  $(Device/tplink-8mlzma)
+  ATH_SOC := ar9331
+  DEVICE_VENDOR := PISEN
+  DEVICE_MODEL := TS-D084
+  DEVICE_PACKAGES := kmod-usb-core kmod-usb2 kmod-usb-chipidea2
+  TPLINK_HWID := 0x07030101
+endef
+TARGET_DEVICES += pisen_ts-d084
+
 define Device/pisen_wmb001n
   ATH_SOC := ar9341
   DEVICE_VENDOR := PISEN