tty: serial: pmac_zilog: include <linux/io.h> insteiad of <asm/io.h>

Include the more general linux/io.h instead of asm/io.h
as checkpatch suggests.
Signed-off-by: Zihao Tang <tangzihao1@hisilicon.com>
Signed-off-by: Jay Fang <f.fangjian@huawei.com>
Link: https://lore.kernel.org/r/1620874904-39285-7-git-send-email-f.fangjian@huawei.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/pmac_zilog.c

@@ -47,7 +47,7 @@
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
 #include <asm/sections.h>
-#include <asm/io.h>
+#include <linux/io.h>
 #include <asm/irq.h>
 
 #ifdef CONFIG_PPC_PMAC