net: Add <cpu_func.h> to some platforms

The common portable header for CPU related functions such as cache
flushing and invalidation is <cpu_func.h> so add that to these drivers.

Signed-off-by: Tom Rini <trini@konsulko.com>

drivers/net/fsl_enetc.c

@@ -6,6 +6,7 @@
  */
 
 #include <clk.h>
+#include <cpu_func.h>
 #include <dm.h>
 #include <errno.h>
 #include <fdt_support.h>

drivers/net/hifemac.c

@@ -9,6 +9,7 @@
 
 #include <dm.h>
 #include <clk.h>
+#include <cpu_func.h>
 #include <miiphy.h>
 #include <net.h>
 #include <reset.h>