clk: qcom: clk-alpha-pll: Remove already enabled warning in PLL configs

It is expected that PLLs are already enabled since
boot usually enable PLLs. clk_hw_get_name can't be
used in clock pre-registration stage since hw->core
will be NULL.

PLL already enabled warning is valid in enable path.

Change-Id: I9040426f2803e5a413d919b143de6fa59098b09b
Signed-off-by: Vivek Aknurwar <viveka@codeaurora.org>