rockchip: rk3328: add soc basic support

RK3328 is a SoC from Rockchip with quad-core Cortex-A53 CPU.
It supports two USB2.0 EHCI ports. Other interfaces are very
much like RK3288, the DRAM are 32bit width address and support
address from 0 to 4GB-16MB range.

Signed-off-by: William Zhang <william.zhang@rock-chips.com>
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Acked-by: Simon Glass <sjg@chromium.org>
Add empty arch/arm/mach-rockchip/rk3328/Kconfig to avoid build error:
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/mach-rockchip/Kconfig b/arch/arm/mach-rockchip/Kconfig
index 565908a..bf8e6be 100644
--- a/arch/arm/mach-rockchip/Kconfig
+++ b/arch/arm/mach-rockchip/Kconfig
@@ -38,6 +38,16 @@
 	  and video codec support. Peripherals include Gigabit Ethernet,
 	  USB2 host and OTG, SDIO, I2S, UARTs, SPI, I2C and PWMs.
 
+config ROCKCHIP_RK3328
+	bool "Support Rockchip RK3328"
+	select ARM64
+	help
+	  The Rockchip RK3328 is a ARM-based SoC with a quad-core Cortex-A53.
+	  including NEON and GPU, 1MB L2 cache, Mali-T7 graphics, two
+	  video interfaces supporting HDMI and eDP, several DDR3 options
+	  and video codec support. Peripherals include Gigabit Ethernet,
+	  USB2 host and OTG, SDIO, I2S, UARTs, SPI, I2C and PWMs.
+
 config ROCKCHIP_RK3399
 	bool "Support Rockchip RK3399"
 	select ARM64
@@ -70,5 +80,6 @@
 source "arch/arm/mach-rockchip/rk3036/Kconfig"
 source "arch/arm/mach-rockchip/rk3188/Kconfig"
 source "arch/arm/mach-rockchip/rk3288/Kconfig"
+source "arch/arm/mach-rockchip/rk3328/Kconfig"
 source "arch/arm/mach-rockchip/rk3399/Kconfig"
 endif