serial: lantiq: Replace lantiq_soc.h with lantiq.h

In this existing lantiq serial driver,
lantiq_soc.h is defined in the arch directory,

./arch/mips/include/asm/mach-lantiq/falcon/lantiq_soc.h
./arch/mips/include/asm/mach-lantiq/xway/lantiq_soc.h

This driver need to be extended to support more platform,
lantiq.h is added in include/linux/ to make it
globally available and provide some wrapper code.
Use lantiq.h to make the driver can find the correct
header file.
Signed-off-by: Songjun Wu <songjun.wu@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/lantiq.c

@@ -15,6 +15,7 @@
 #include <linux/init.h>
 #include <linux/io.h>
 #include <linux/ioport.h>
+#include <linux/lantiq.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
 #include <linux/of_platform.h>
@@ -25,8 +26,6 @@
 #include <linux/tty.h>
 #include <linux/tty_flip.h>
 
-#include <lantiq_soc.h>
-
 #define PORT_LTQ_ASC		111
 #define MAXPORTS		2
 #define UART_DUMMY_UER_RX	1