serial: ucc_uart: explicitly include soc/fsl/cpm.h

This driver uses #defines from soc/fsl/cpm.h, so instead of relying on
some other header pulling that in, do that explicitly. This is
preparation for allowing this driver to build on ARM.
Reviewed-by: Timur Tabi <timur@kernel.org>
Acked-by: Timur Tabi <timur@kernel.org>
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Li Yang <leoyang.li@nxp.com>

drivers/tty/serial/ucc_uart.c

@@ -32,6 +32,7 @@
 #include <soc/fsl/qe/ucc_slow.h>
 
 #include <linux/firmware.h>
+#include <soc/fsl/cpm.h>
 #include <asm/reg.h>
 
 /*