[MIPS] time: Move R4000 clockevent device code to separate configurable file

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/au1000/Kconfig b/arch/mips/au1000/Kconfig
index a23d415..b36cec58 100644
--- a/arch/mips/au1000/Kconfig
+++ b/arch/mips/au1000/Kconfig
@@ -137,6 +137,7 @@
 config SOC_AU1X00
 	bool
 	select 64BIT_PHYS_ADDR
+	select CEVT_R4K
 	select IRQ_CPU
 	select SYS_HAS_CPU_MIPS32_R1
 	select SYS_SUPPORTS_32BIT_KERNEL