Input: psmouse - move sliced command implementation to libps2

In preparation to adding some debugging statements to PS/2 control
sequences let's move psmouse_sliced_command() into libps2 and rename it
to ps2_sliced_command().

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
diff --git a/include/linux/libps2.h b/include/linux/libps2.h
index 646b581..3c69cd7 100644
--- a/include/linux/libps2.h
+++ b/include/linux/libps2.h
@@ -15,6 +15,8 @@
 #include <linux/types.h>
 #include <linux/wait.h>
 
+#define PS2_CMD_SETSCALE11	0x00e6
+#define PS2_CMD_SETRES		0x10e8
 #define PS2_CMD_GETID		0x02f2
 #define PS2_CMD_RESET_BAT	0x02ff
 
@@ -52,6 +54,7 @@ void ps2_begin_command(struct ps2dev *ps2dev);
 void ps2_end_command(struct ps2dev *ps2dev);
 int __ps2_command(struct ps2dev *ps2dev, u8 *param, unsigned int command);
 int ps2_command(struct ps2dev *ps2dev, u8 *param, unsigned int command);
+int ps2_sliced_command(struct ps2dev *ps2dev, u8 command);
 bool ps2_handle_ack(struct ps2dev *ps2dev, u8 data);
 bool ps2_handle_response(struct ps2dev *ps2dev, u8 data);
 void ps2_cmd_aborted(struct ps2dev *ps2dev);