clk: qcom: smd-rpm: Remove rf_clk3 instance for QCS405

RF_CLK3 is no longer required from HW side. So remove
support for the same in RPM clock driver.

Change-Id: Idca9a31ddea21d48e6fbd0d14d28cf3c5c6d0ff3
Signed-off-by: Shefali Jain <shefjain@codeaurora.org>