Update broken web addresses in arch directory.

The patch below updates broken web addresses in the arch directory.

Signed-off-by: Justin P. Mattock <justinmattock@gmail.com>
Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: Finn Thain <fthain@telegraphics.com.au>
Cc: Randy Dunlap <rdunlap@xenotime.net>
Reviewed-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/arch/arm/common/icst.c b/arch/arm/common/icst.c
index 9a7f09c..2dc6da70 100644
--- a/arch/arm/common/icst.c
+++ b/arch/arm/common/icst.c
@@ -8,7 +8,7 @@
  * published by the Free Software Foundation.
  *
  *  Support functions for calculating clocks/divisors for the ICST307
- *  clock generators.  See http://www.icst.com/ for more information
+ *  clock generators.  See http://www.idt.com/ for more information
  *  on these devices.
  *
  *  This is an almost identical implementation to the ICST525 clock generator.