Staging: hv: hv_mouse: fix camelcase in struct synthhid_device_info_ack

Just one field to fix up, s/Reserved/reserved/g
Odd that we have to set the reserved field to 0 when we send the
message, that would imply that it really isn't "reserved"...

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>