Convert MIPS i8253 clocksource code to use generic i8253 clocksource.
Acked-by: NJohn Stultz <john.stultz@linaro.org>
Acked-by: NThomas Gleixner <tglx@linutronix.de>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>