clocksource: convert mips to generic i8253 clocksource

Convert MIPS i8253 clocksource code to use generic i8253 clocksource.

Acked-by: John Stultz <john.stultz@linaro.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 8e256cc..f7f6419 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -2339,6 +2339,7 @@
 
 config I8253
 	bool
+	select CLKSRC_I8253
 	select MIPS_EXTERNAL_TIMER
 
 config ZONE_DMA32