staging: unisys: visorbus: Replace parser_param_start with parser_name_get

Replace the general CONTROLVM string parser setup which only handled the
name string with a specific name string retrieval function.

Signed-off-by: Bryan Thompson <bryan.thompson@unisys.com>
Signed-off-by: David Kershner <david.kershner@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>