ARM: ICST: kill duplicate icst code

The only difference between ICST307 and ICST525 are the two arrays
for calculating the S parameter; the code is now identical.  Merge
the two files and kill the duplicated code.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mach-integrator/impd1.c b/arch/arm/mach-integrator/impd1.c
index e24cfc3..3e21102 100644
--- a/arch/arm/mach-integrator/impd1.c
+++ b/arch/arm/mach-integrator/impd1.c
@@ -24,7 +24,7 @@
 
 #include <asm/clkdev.h>
 #include <mach/clkdev.h>
-#include <asm/hardware/icst525.h>
+#include <asm/hardware/icst.h>
 #include <mach/lm.h>
 #include <mach/impd1.h>
 #include <asm/sizes.h>