serial: core: Add the Raspberry Pi firmware UART id

Assign a new serial core number for the RPi firmware UART.

Signed-off-by: Tim Gover <tim.gover@raspberrypi.com>

Author: timg236

include/uapi/linux/serial_core.h

@@ -231,6 +231,9 @@
 /* Sunplus UART */
 #define PORT_SUNPLUS	123
 
+/* RPi firmware UART */
+#define PORT_RPI_FW	124
+
 /* Generic type identifier for ports which type is not important to userspace. */
 #define PORT_GENERIC	(-1)