HID: google: modify HID device groups of eel

If HID_GROUP of eel is set to HID_GROUP_GENERIC, Whiskers Tablet Mode
Switch of eel hammer will not be detected by system because the
hid-vivaldi driver probes the device. When it is set to
HID_GROUP_VIVALDI, system will detect Whiskers Tablet Mode Switch
successfully and also support the vivaldi keyboard layout.

Tested-by: "Sean O'Brien" <seobrien@chromium.org>
Acked-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Zhengqiao Xia <xiazhengqiao@huaqin.corp-partner.google.com>
[swboyd@chromium.org: Expand on commit text]
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Tested-by: Stephen Boyd <swboyd@chromium.org> # coachz, wormdingler
Link: https://lore.kernel.org/r/20220228075446.466016-6-dmitry.torokhov@gmail.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>