[ARM] Move HZ definition into Kconfig

Move the HZ definition into Kconfig, and set appropriate defaults
for platforms.  Remove mostly empty asm/arch/param.h include file.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/include/asm-arm/param.h b/include/asm-arm/param.h
index 94223d4d..1580646 100644
--- a/include/asm-arm/param.h
+++ b/include/asm-arm/param.h
@@ -11,12 +11,7 @@
 #define __ASM_PARAM_H
 
 #ifdef __KERNEL__
-# include <asm/arch/param.h>		/* for kernel version of HZ */
-
-# ifndef HZ
-#  define HZ		100		/* Internal kernel timer frequency */
-# endif
-
+# define HZ		CONFIG_HZ	/* Internal kernel timer frequency */
 # define USER_HZ	100		/* User interfaces are in "ticks" */
 # define CLOCKS_PER_SEC	(USER_HZ)	/* like times() */
 #else