input: elantech - force needed quirks on Fujitsu H760

[Matti Kurkela <Matti.Kurkela@iki.fi>]

Just like Fujitsu CELSIUS H730, the H760 also has an Elantech touchpad 
with the same quirks. Without this patch, the touchpad is useless 
out-of-the-box as the mouse pointer won't move.

This patch makes the driver aware of both the crc_enabled=1
requirement and the middle button, making the touchpad fully
functional out-of-the-box.

Signed-off-by: Matti Kurkela <Matti.Kurkela@iki.fi>
---
This patch will also apply without changes to older kernel versions:
I made this originally on 4.4.19 and am currently using it on
my work laptop with 4.4.22.

Backporting to any version that includes commit
f386474e12a560e005ec7899e78f51f6bdc3cf41 should be trivial.

--- linux-4.8/drivers/input/mouse/elantech.c.orig	2016-10-03 02:24:33.000000000 +0300
+++ linux-4.8/drivers/input/mouse/elantech.c	2016-10-03 20:19:17.175141070 +0300
@@ -1159,6 +1159,13 @@ static const struct dmi_system_id elante
  			DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H730"),
  		},
  	},
+	{
+		/* Fujitsu H760 also has a middle button */
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H760"),
+		},
+	},
  #endif
  	{ }
  };
@@ -1503,6 +1510,13 @@ static const struct dmi_system_id elante
  		},
  	},
  	{
+		/* Fujitsu H760 does not work with crc_enabled == 0 */
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H760"),
+		},
+	},
+	{
  		/* Fujitsu LIFEBOOK E554  does not work with crc_enabled == 0 */
  		.matches = {
  			DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),