rockchip: rk3368: move STACK_R_ADDR address and into Kconfig

With the STACK_R_ADDR at 0x600000 (6MB) we're competing with
with the loading address of either u-boot or atf parts, so move
that away to 0x4000000 (64MB) similar to rk3399.

Only lion currently sets that at all but not sheep the second
rk3368 board, so just move that to the Kconfig for rk3368 similar
to rk3399 as well.

Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/mach-rockchip/rk3368/Kconfig b/arch/arm/mach-rockchip/rk3368/Kconfig
index c31915e..78eb96d 100644
--- a/arch/arm/mach-rockchip/rk3368/Kconfig
+++ b/arch/arm/mach-rockchip/rk3368/Kconfig
@@ -65,6 +65,9 @@
 config SPL_LDSCRIPT
 	default "arch/arm/cpu/armv8/u-boot-spl.lds"
 
+config SPL_STACK_R_ADDR
+	default 0x04000000
+
 config TPL_MAX_SIZE
         default 28672