serial: sc16is7xx: remove SC16IS7XX_MSR_DELTA_MASK

This definition isn't used anywhere anymore, let's delete it.

Reviewed-by: Andy Shevchenko <[email protected]>
Signed-off-by: Lech Perczak <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: Leo-PL

drivers/tty/serial/sc16is7xx.c

@@ -208,7 +208,6 @@
 #define SC16IS7XX_MSR_CD_BIT		(1 << 7) /* CD (IO6)
 						  * - only on 75x/76x
 						  */
-#define SC16IS7XX_MSR_DELTA_MASK	0x0F     /* Any of the delta bits! */
 
 /*
  * TCR register bits