README.md: Add Rockchip RK322X description

Signed-off-by: Joseph Chen <[email protected]>
Acked-by: Jerome Forissier <[email protected]>

README.md

@@ -60,6 +60,7 @@ platforms have different sub-maintainers, please refer to the file
 | [QEMUv8](http://wiki.qemu.org/Main_Page) |`PLATFORM=vexpress-qemu_armv8a`| Yes |
 | [Raspberry Pi 3](https://www.raspberrypi.org/products/raspberry-pi-3-model-b) |`PLATFORM=rpi3`| Yes |
 | [Renesas RCAR](https://www.renesas.com/en-sg/solutions/automotive/products/rcar-h3.html)|`PLATFORM=rcar`| No |
+| [Rockchip RK322X](http://www.rock-chips.com/a/en/products/RK32_Series/2016/1109/799.html) |`PLATFORM=rockchip-rk322x`| No |
 | [STMicroelectronics b2260 - h410 (96boards fmt)](http://www.st.com/web/en/catalog/mmc/FM131/SC999/SS1628/PF258776) |`PLATFORM=stm-b2260`| No |
 | [STMicroelectronics b2120 - h310 / h410](http://www.st.com/web/en/catalog/mmc/FM131/SC999/SS1628/PF258776) |`PLATFORM=stm-cannes`| No |
 | [Texas Instruments DRA7xx](http://www.ti.com/product/DRA746)|`PLATFORM=ti-dra7xx`| Yes |