msm: clock.h: Fix compile with CONFIG_DEBUG_FS=n

The prototypes for clock_debug_init() differ between the debugfs
on and off case in the type of argument passed. Make them the
same to fix a compile error.

Change-Id: I905b9f1c752e3b419d0a1646b51a6ac1e54cfecc
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>