mfd: Export wm8400_block_read()

Used by the regulator driver.
Reported-by: NStephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>

drivers/mfd/wm8400-core.c

@@ -60,6 +60,7 @@ int wm8400_block_read(struct wm8400 *wm8400, u8 reg, int count, u16 *data)
 {
 	return regmap_bulk_read(wm8400->regmap, reg, data, count);
 }
+EXPORT_SYMBOL_GPL(wm8400_block_read);
 
 static int wm8400_register_codec(struct wm8400 *wm8400)
 {