pxa: fixing get_timer to return time in miliseconds.

Fixing the get_timer function to return time in miliseconds instead of
ticks. Also fixed PXA boards to use the conventional value of 1000 for
CONFIG_SYS_HZ.

Signed-off-by: Micha Kalfon <smichak.uv@gmail.com>
diff --git a/include/configs/cerf250.h b/include/configs/cerf250.h
index 71e5b58..f19374e 100644
--- a/include/configs/cerf250.h
+++ b/include/configs/cerf250.h
@@ -117,7 +117,7 @@
 
 #define CONFIG_SYS_LOAD_ADDR		0xa2000000	/* default load address */
 
-#define CONFIG_SYS_HZ				3686400		/* incrementer freq: 3.6864 MHz */
+#define CONFIG_SYS_HZ			1000
 #define CONFIG_SYS_CPUSPEED		0x141		/* set core clock to 400/200/100 MHz */
 
 #define CONFIG_SYS_BAUDRATE_TABLE	{ 9600, 19200, 38400, 57600, 115200 }