arm64: Kconfig: select sp804 timer for ARCH_HISI

Select sp804 timer for ARCH_HISI, which is used as broadcast timer.
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Signed-off-by: Wei Xu <xuwei5@hisilicon.com>

arch/arm64/Kconfig.platforms

@@ -45,6 +45,7 @@ config ARCH_LAYERSCAPE
 
 config ARCH_HISI
 	bool "Hisilicon SoC Family"
+	select ARM_TIMER_SP804
 	select HISILICON_IRQ_MBIGEN
 	help
 	  This enables support for Hisilicon ARMv8 SoC family