tty: reserve N_SPEAKUP number

Over in the staging tree, N_SPEAKUP is added, so to make life easier for
merging and other development, also reserve it in the tty tree.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

include/uapi/linux/tty.h

@@ -35,5 +35,6 @@
 #define N_TRACESINK	23	/* Trace data routing for MIPI P1149.7 */
 #define N_TRACEROUTER	24	/* Trace data routing for MIPI P1149.7 */
 #define N_NCI		25	/* NFC NCI UART */
+#define N_SPEAKUP	26	/* Speakup communication with synths */
 
 #endif /* _UAPI_LINUX_TTY_H */