clk: define LOG_CATEGORY for generic and ccf clocks

Define LOG_CATEGORY to allow filtering with log command
for generic clock and CCF clocks.

This patch also change existing printf, debug and pr_ macro
to log_ or dev_ macro.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Sean Anderson <seanga2@gmail.com>
diff --git a/drivers/clk/clk-composite.c b/drivers/clk/clk-composite.c
index 12288e1..6eb2b81 100644
--- a/drivers/clk/clk-composite.c
+++ b/drivers/clk/clk-composite.c
@@ -4,9 +4,12 @@
  * Copyright 2019 NXP
  */
 
+#define LOG_CATEGORY UCLASS_CLK
+
 #include <common.h>
 #include <clk.h>
 #include <clk-uclass.h>
+#include <log.h>
 #include <malloc.h>
 #include <asm/io.h>
 #include <dm/device.h>