clocksource: cadence_ttc: Remove clk-provider.h include

This file doesn't use the clk provider APIs. Remove the include.

Cc: Michal Simek <michal.simek@xilinx.com>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>