HID: elecom: extend to fix the descriptor for DEFT trackballs

The ELECOM DEFT trackballs report only five buttons, when the device
actually has 8. Change the descriptor so that the HID driver can see all of
them.

For completeness and future reference, I included a side-by-side diff of
the part of the descriptor that is being edited.

Cc: Jiri Kosina <jikos@kernel.org>
Cc: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Cc: Yuxuan Shui <yshuiv7@gmail.com>
Signed-off-by: Diego Elio Pettenò <flameeyes@flameeyes.eu>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index fe40e5e..687705c 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -275,10 +275,12 @@
 	 - Trio Linker Plus II
 
 config HID_ELECOM
-	tristate "ELECOM BM084 bluetooth mouse"
+	tristate "ELECOM HID devices"
 	depends on HID
 	---help---
-	Support for the ELECOM BM084 (bluetooth mouse).
+	Support for ELECOM devices:
+	  - BM084 Bluetooth Mouse
+	  - DEFT Trackball (Wired and wireless)
 
 config HID_ELO
 	tristate "ELO USB 4000/4500 touchscreen"