clk: qcom: gcc-msm8994: explicitly include clk-provider.h

Per Stephen, clk providers need to include clk-provider.h, so include in
this driver as well

Signed-off-by: Vinod Koul <[e-mail]>
Reviewed-by: Stephen Boyd <[e-mail]>
Signed-off-by: Bjorn Andersson <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/clk/qcom/gcc-msm8994.c

···
 /* Copyright (c) 2013-2016, The Linux Foundation. All rights reserved.
  */
 
+#include <linux/clk-provider.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/err.h>