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 <[e-mail]>
Signed-off-by: Jay Fang <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/tty/serial/pmac_zilog.c

···
 #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