clk: Move clk_debug_print_enabled to linux clk header

Global clk header API must be in linux clk include diretory.
Move clk_debug_print_enabled prototype to linux header
from local clk.h header.

Change-Id: Ie40349620f60e16fb9aa89a7a97cc03d164b638e
Signed-off-by: Vivek Aknurwar <viveka@codeaurora.org>