ARM: 5639/1: arm: clkdev.c should include <linux/clk.h>

<linux/clk.h> should be included to get the base API prototypes.

This fixes the following sparse warnings:

arch/arm/common/clkdev.c:65:12:
warning: symbol 'clk_get_sys' was not declared. Should it be static?

arch/arm/common/clkdev.c:79:12:
warning: symbol 'clk_get' was not declared. Should it be static?

arch/arm/common/clkdev.c:87:6:
warning: symbol 'clk_put' was not declared. Should it be static?

Signed-off-by: H Hartley Sweeten <[e-mail]>
Signed-off-by: Russell King <[e-mail]>

arch/arm/common/clkdev.c

···
 #include <linux/err.h>
 #include <linux/string.h>
 #include <linux/mutex.h>
+#include <linux/clk.h>
 
 #include <asm/clkdev.h>
 #include <mach/clkdev.h>