clk: msm: clock-pll: Remove list_registers callback for CPU PLLs

The register offsets for the CPU PLLs might vary with
the standard offsets used for other PLLs. Remove having
the print capability for these clocks.

CRs-Fixed: 941434
Change-Id: Id67a70117b0621d98ac010f712552ecaaf92641f
Signed-off-by: Deepak Katragadda <dkatraga@codeaurora.org>