rockchip: evb-px5: switch to use ARM generic timer

Default to use ARM generic timer in ARM64, switch from
rk timer to generic timer.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/dts/rk3368-px5-evb-u-boot.dtsi b/arch/arm/dts/rk3368-px5-evb-u-boot.dtsi
index f5406d4..002767a 100644
--- a/arch/arm/dts/rk3368-px5-evb-u-boot.dtsi
+++ b/arch/arm/dts/rk3368-px5-evb-u-boot.dtsi
@@ -5,7 +5,6 @@
 / {
 	chosen {
 		u-boot,spl-boot-order = &emmc;
-		tick-timer = "/timer@ff810000";
 	};
 };
 
diff --git a/configs/evb-px5_defconfig b/configs/evb-px5_defconfig
index 9afba9b..a2b72c7 100644
--- a/configs/evb-px5_defconfig
+++ b/configs/evb-px5_defconfig
@@ -67,10 +67,6 @@
 CONFIG_DEBUG_UART_SHIFT=2
 CONFIG_DEBUG_UART_SKIP_INIT=y
 CONFIG_SYSRESET=y
-CONFIG_TIMER=y
-CONFIG_SPL_TIMER=y
-CONFIG_TPL_TIMER=y
-CONFIG_ROCKCHIP_TIMER=y
 CONFIG_USE_TINY_PRINTF=y
 CONFIG_PANIC_HANG=y
 CONFIG_SPL_TINY_MEMSET=y