Staging: hv: hv_mouse: fix up input device info structure

Make the name "hv_" specific as it's not an input layer structure we are
dealing with here.  Also rename the fields to be not CamelCase.

Cc: Hank Janssen <hjanssen@microsoft.com>
Cc: K. Y. Srinivasan <kys@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>