msm_11ad: remove control of rf_clk3_pin if not defined in dts

On sm8150 “rf_clk3_pin_clk” maps to RPMH_RF_CLK3_A.
That corresponds to an APPS active-only vote for RFCLK3A and not for
clock pin control enable.
Therefore, “rf_clk3_pin_clk” should not be controlled by 11ad device
on sm8150.

Change-Id: I2d47ab709a3d5cacab609ccb0ea8561c248bf782
Signed-off-by: Maya Erez <merez@codeaurora.org>