wil6210: disable sensing when support_sensing_over_spi is unset

RGF_USER_USAGE_6 is not cleared on SW reset, hence needs
to clear this bit when support_sensing_over_spi is not set to
prevent a case where it is set from previous run.

Change-Id: Id5da75ce522e9955c9095cecf346a506d6fd4e1b
Signed-off-by: Maya Erez <merez@codeaurora.org>