bmips: bcm6358: add support for Huawei HG556a ver C

Specifications:
- SoC: Broadcom BCM6358 dual 300MHz MIPS
- Flash: 16MB NOR Macronix MX29GL128EHT2I-90G
- RAM: 64MB DDR
- Ethernet: 4x 100M
- Wifi: Ralink RT3062F
- 3x USB 2.0 port
- 4x Button
- 13x LED
- RJ11 2x FXS VoIP (unsupported)
- RJ11 xDSL (unsupported)

Install instructions:
- Assign static IP 192.168.1.100 to PC.
- Unplug the power source.
- Press the RESTART button at the router, don't release it yet!
- Plug the power source and wait at least 15 seconds.
- Release the RESTART button.
- Browse to http://192.168.1.1 with your PC.
- Upload the openwrt-bmips-bcm6358-huawei_hg556a-c-squashfs-cfe.bin file.
- Wait some minutes until the firmware upgrade completes.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

target/linux/bmips/image/Makefile

@@ -366,6 +366,7 @@ endef
 ### Package helpers ###
 ATH9K_PACKAGES := kmod-ath9k kmod-owl-loader wpad-basic-mbedtls
 B43_PACKAGES := kmod-b43 wpad-basic-mbedtls
+RT28_PACKAGES := kmod-rt2800-pci wpad-basic-mbedtls
 USB1_PACKAGES := kmod-usb-ohci kmod-usb-ledtrig-usbport
 USB2_PACKAGES := $(USB1_PACKAGES) kmod-usb2
 

target/linux/bmips/image/bcm6358.mk

@@ -27,3 +27,17 @@ define Device/huawei_hg556a-b
     kmod-leds-gpio
 endef
 TARGET_DEVICES += huawei_hg556a-b
+
+define Device/huawei_hg556a-c
+  $(Device/bcm63xx-cfe-legacy)
+  DEVICE_VENDOR := Huawei
+  DEVICE_MODEL := EchoLife HG556a
+  DEVICE_VARIANT := C
+  CHIP_ID := 6358
+  CFE_BOARD_ID := HW556
+  CFE_EXTRAS += --rsa-signature "EchoLife_HG556a" --tag-version 8
+  BLOCKSIZE := 0x20000
+  DEVICE_PACKAGES += $(USB2_PACKAGES) $(RT28_PACKAGES) \
+    kmod-leds-gpio
+endef
+TARGET_DEVICES += huawei_hg556a-c