arm: rockchip: Add RK3308 SOC support

RK3308 is a quad Cortex A35 based SOC with rich audio
interfaces(I2S/PCM/TDM/PDM/SPDIF/VAD/HDMI ARC), which
designed for intelligent voice interaction and audio
input/output processing.

Signed-off-by: Andy Yan <andy.yan@rock-chips.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/mach-rockchip/Kconfig b/arch/arm/mach-rockchip/Kconfig
index 3cb934a..4936994 100644
--- a/arch/arm/mach-rockchip/Kconfig
+++ b/arch/arm/mach-rockchip/Kconfig
@@ -127,6 +127,29 @@
 	  and video codec support. Peripherals include Gigabit Ethernet,
 	  USB2 host and OTG, SDIO, I2S, UARTs, SPI, I2C and PWMs.
 
+config ROCKCHIP_RK3308
+	bool "Support Rockchip RK3308"
+	select ARM64
+	select DEBUG_UART_BOARD_INIT
+	select SUPPORT_SPL
+	select SUPPORT_TPL
+	select SPL
+	select SPL_ATF
+	select SPL_ATF_NO_PLATFORM_PARAM
+	select SPL_LOAD_FIT
+	imply ROCKCHIP_COMMON_BOARD
+	imply SPL_ROCKCHIP_COMMON_BOARD
+	imply SPL_CLK
+	imply SPL_REGMAP
+	imply SPL_SYSCON
+	imply SPL_RAM
+	imply SPL_SERIAL_SUPPORT
+	imply TPL_SERIAL_SUPPORT
+	imply SPL_SEPARATE_BSS
+	help
+	  The Rockchip RK3308 is a ARM-based Soc which embedded with quad
+	  Cortex-A35 and highly integrated audio interfaces.
+
 config ROCKCHIP_RK3328
 	bool "Support Rockchip RK3328"
 	select ARM64
@@ -345,6 +368,7 @@
 source "arch/arm/mach-rockchip/rk3188/Kconfig"
 source "arch/arm/mach-rockchip/rk322x/Kconfig"
 source "arch/arm/mach-rockchip/rk3288/Kconfig"
+source "arch/arm/mach-rockchip/rk3308/Kconfig"
 source "arch/arm/mach-rockchip/rk3328/Kconfig"
 source "arch/arm/mach-rockchip/rk3368/Kconfig"
 source "arch/arm/mach-rockchip/rk3399/Kconfig"