sh: Obey CONFIG_HZ for HZ definition.

This wasn't being set before, so now it's set for when it makes sense.
The shwdt case still requires HZ to be fixed at 1000 for the WOVF period,
so this is still preserved.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

include/asm-sh/param.h

@@ -5,7 +5,7 @@
 # ifdef CONFIG_SH_WDT
 #  define HZ		1000		/* Needed for high-res WOVF */
 # else
-#  define HZ		100
+#  define HZ		CONFIG_HZ
 # endif
 # define USER_HZ	100		/* User interfaces are in "ticks" */
 # define CLOCKS_PER_SEC	(USER_HZ)	/* frequency at which times() counts */