Revert "msm_11ad: keep rf_clk3 on during wil6210 activity"

This reverts commit 69c7b7f05838 ("msm_11ad: keep rf_clk3
on during wil6210 activity").
In case 11ad device controls refclk3 after FW download is completed,
it is safe to disable it from host and leave the GPIO control.
In addition, check the return value from msm_11ad_enable_clk.

Change-Id: Iee67284b71fab87c2b4a002d7e67d24ef83a9ac9
Signed-off-by: Maya Erez <merez@codeaurora.org>