mfd: Move ab8500 gpadc header to subdir

This moves the ab8500-gpadc.h header down into the ab8500/
subdir in include/linux/mfd and fixes some whitespace in the
header in the process.
Signed-off-by: Daniel Willerud <daniel.willerud@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/mfd/ab8500-gpadc.c

@@ -17,7 +17,7 @@
 #include <linux/slab.h>
 #include <linux/mfd/ab8500.h>
 #include <linux/mfd/abx500.h>
-#include <linux/mfd/ab8500-gpadc.h>
+#include <linux/mfd/ab8500/ab8500-gpadc.h>
 
 /*
  * GPADC register offsets