Staging: vt6655: Move rate determination logic.

Factor rate setting logic out of nested if-else statement to prevent
code duplication.

Signed-off-by: Briana Oursler <briana.oursler@gmail.com>
Reviewed-by: Stefano Brivio <sbrivio@redhat.com>
Link: https://lore.kernel.org/r/ba87af8a2d28d5737c6d8888bbda143aad723d2c.1585763457.git.briana.oursler@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>