HID: roccat: enable Savu device reset

Device can be reset to factory state by sending a command via info sysfs attr.
Changed from ro to rw to enable this feature.

Signed-off-by: Stefan Achatz <[e-mail]>
Signed-off-by: Jiri Kosina <[e-mail]>

Documentation/ABI/testing/sysfs-driver-hid-roccat-savu

···
 Date:		Mai 2012
 Contact:	Stefan Achatz <[e-mail]>
 Description:	When read, this file returns general data like firmware version.
+		When written, the device can be reset.
 		The data is 8 bytes long.
-		This file is readonly.
 Users:		http://roccat.sourceforge.net
 
 What:		/sys/bus/usb/devices/<busnum>-<devnum>:<config num>.<interface num>/<hid-bus>:<vendor-id>:<product-id>.<num>/savu/roccatsavu<minor>/macro
···
 		This file allows reading and writing of the mouse sensors registers.
 		The data has to be 4 bytes long.
 Users:		http://roccat.sourceforge.net
-

drivers/hid/hid-roccat-savu.c

···
 SAVU_SYSFS_RW(general, GENERAL)
 SAVU_SYSFS_RW(buttons, BUTTONS)
 SAVU_SYSFS_RW(macro, MACRO)
-SAVU_SYSFS_R(info, INFO)
+SAVU_SYSFS_RW(info, INFO)
 SAVU_SYSFS_RW(sensor, SENSOR)
 
 static struct bin_attribute savu_bin_attributes[] = {
···
 	SAVU_BIN_ATTRIBUTE_RW(general, GENERAL),
 	SAVU_BIN_ATTRIBUTE_RW(buttons, BUTTONS),
 	SAVU_BIN_ATTRIBUTE_RW(macro, MACRO),
-	SAVU_BIN_ATTRIBUTE_R(info, INFO),
+	SAVU_BIN_ATTRIBUTE_RW(info, INFO),
 	SAVU_BIN_ATTRIBUTE_RW(sensor, SENSOR),
 	__ATTR_NULL
 };