staging: vt6655: Remove unnecessary parentheses

Fix the checkpatch warnings of kind:

Unnecessary parentheses around priv->apTD1Rings[0]

Remove the parentheses around variables
being referenced.

Signed-off-by: Sreya Mittal <sreyamittal5@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>