clk: qcom: clk-pll: Support list_registers callback for HF PLL

For hf pll, register content is required to be display
for debug purpose. Add support for the same by adding
list_register clock ops to clk_pll_hf_ops.

Change-Id: I3e392668542e99e09f420f8c9a6ce4b9172e2eb8
Signed-off-by: Shefali Jain <shefjain@codeaurora.org>