configs: rockchip: rk3036: Fix CONFIG_SPL_STACK define

The CONFIG_SPL_STACK for rk3036 is removed in below patch, need to add
it back.

Fixes: f113d7d3034 ("Convert CONFIG_SPL_STACK to Kconfig")
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/configs/evb-rk3036_defconfig b/configs/evb-rk3036_defconfig
index a5a4e36..e21bea9 100644
--- a/configs/evb-rk3036_defconfig
+++ b/configs/evb-rk3036_defconfig
@@ -15,6 +15,7 @@
 CONFIG_SPL_TEXT_BASE=0x10081000
 CONFIG_ROCKCHIP_RK3036=y
 CONFIG_SPL_STACK_R_ADDR=0x80000
+CONFIG_SPL_STACK=0x10081fff
 CONFIG_DEBUG_UART_BASE=0x20068000
 CONFIG_DEBUG_UART_CLOCK=24000000
 CONFIG_SYS_LOAD_ADDR=0x60800800