mfd: Unify abx500 headers in mfd/abx500

This moves all the header files related to the abx500 family into
a common include directory below mfd. From now on we place any
subchip header in that directory. Headers previously in e.g.
<linux/mfd/ab8500/gpio.h> get prefixed and are now e.g.
<linux/mfd/abx500/ab8500-gpio.h>. The top-level abstract interface
remains in <linux/mfd/abx500.h>.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/drivers/mfd/ab5500-core.c b/drivers/mfd/ab5500-core.c
index ec10629..bd56a76 100644
--- a/drivers/mfd/ab5500-core.c
+++ b/drivers/mfd/ab5500-core.c
@@ -22,8 +22,8 @@
 #include <linux/irq.h>
 #include <linux/interrupt.h>
 #include <linux/random.h>
-#include <linux/mfd/ab5500/ab5500.h>
 #include <linux/mfd/abx500.h>
+#include <linux/mfd/abx500/ab5500.h>
 #include <linux/list.h>
 #include <linux/bitops.h>
 #include <linux/spinlock.h>