MLK-16804-02 arm64: configs: enable the system counter timer for nxp imx8

Enable the system counter timer by default.

Signed-off-by: Bai Ping <ping.bai@nxp.com>
Reviewed-by: Anson Huang <anson.huang@nxp.com>

arch/arm64/configs/defconfig

@@ -626,6 +626,7 @@ CONFIG_MSM_GCC_8994=y
 CONFIG_MSM_MMCC_8996=y
 CONFIG_HWSPINLOCK=y
 CONFIG_HWSPINLOCK_QCOM=y
+CONFIG_CLKSRC_IMX_SYS_CNT=y
 CONFIG_ARM_MHU=y
 CONFIG_PLATFORM_MHU=y
 CONFIG_BCM2835_MBOX=y