clk: qcom: clk-rcg2: Clear the HW_CLK_CONTROL bit of the RCG

For some clock sources, the HW clock control is enabled
by default. This feature is not used by software. Hence
disable it.

Change-Id: I5db4141f20824d6d9ed0655b7f823ed770da90bc
Signed-off-by: Deepak Katragadda <dkatraga@codeaurora.org>