OMAP clock: resolve all remaining sparse warnings

Resolve all remaining sparse warnings in the OMAP clock code.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
diff --git a/arch/arm/plat-omap/clock.c b/arch/arm/plat-omap/clock.c
index e0f72f4..0ae2753 100644
--- a/arch/arm/plat-omap/clock.c
+++ b/arch/arm/plat-omap/clock.c
@@ -173,7 +173,7 @@
  * OMAP specific clock functions shared between omap1 and omap2
  *-------------------------------------------------------------------------*/
 
-unsigned int __initdata mpurate;
+int __initdata mpurate;
 
 /*
  * By default we use the rate set by the bootloader.