wil6210: update vr profile defaults

This patch sets agg_wsize to 16 when VR profile is set,
and resets it to default value when VR profile is disabled.

Change-Id: I5ed18f7f8c361d771d656985d710376aa1d41e08
Signed-off-by: Hrishikesh Vidwans <hvidwans@codeaurora.org>