omap2420-h4: Fix get_timer() and CONFIG_SYS_HZ

The function get_timer() should return time in ms and CONFIG_SYS_HZ
should be set to 1000 by default. Fix both of these items.

Signed-off-by: Jon Hunter <jon-hunter@ti.com>
diff --git a/include/configs/omap2420h4.h b/include/configs/omap2420h4.h
index e144ae9d..04e8d3a 100644
--- a/include/configs/omap2420h4.h
+++ b/include/configs/omap2420h4.h
@@ -190,7 +190,7 @@
 
 #define CONFIG_SYS_TIMERBASE		OMAP2420_GPT2
 #define CONFIG_SYS_PTV			V_PTV	/* 2^(PTV+1) */
-#define CONFIG_SYS_HZ			((CONFIG_SYS_CLK_FREQ)/(2 << CONFIG_SYS_PTV))
+#define CONFIG_SYS_HZ			1000
 
 /*-----------------------------------------------------------------------
  * Physical Memory Map