[ARM] omap: fix omap clk support build errors

arch/arm/plat-omap/clock.c:397: warning: "struct cpufreq_frequency_table" declared inside parameter list
arch/arm/plat-omap/clock.c:397: warning: its scope is only this definition or declaration, which is probably not what you want
arch/arm/plat-omap/clock.c: In function `clk_init_cpufreq_table':
arch/arm/plat-omap/clock.c:402: error: structure has no member named `clk_init_cpufreq_table'
arch/arm/plat-omap/clock.c:403: error: structure has no member named `clk_init_cpufreq_table'

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/plat-omap/clock.c

@@ -21,6 +21,7 @@
 #include <linux/clk.h>
 #include <linux/mutex.h>
 #include <linux/platform_device.h>
+#include <linux/cpufreq.h>
 
 #include <asm/io.h>