ns9xxx: fix assembler version of __REG2 to be consistent with the C version

It's not very critical because __REG2 isn't used in assembler code
currently.

Additionally some white space noise is fixed.
Signed-off-by: Uwe Kleine-König <Uwe.Kleine-Koenig@digi.com>

include/asm-arm/arch-ns9xxx/hardware.h

@@ -72,7 +72,7 @@
 #else
 
 #  define __REG(x)	io_p2v(x)
-#  define __REG2(x, y)	io_p2v((x) + (y))
+#  define __REG2(x, y)	io_p2v((x) + 4 * (y))
 
 #endif