serial: sc16is7xx: improve comments about variants

Replace 740/750/760 with generic terms like 74x/75x/76x to account for
variants like 741, 752 and 762.

Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>
Reviewed-by: Lech Perczak <lech.perczak@camlingroup.com>
Link: https://lore.kernel.org/r/20230905151300.15365-1-hugo@hugovil.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/sc16is7xx.c

@@ -223,7 +223,7 @@
  * trigger levels. Trigger levels from 4 characters to 60 characters are
  * available with a granularity of four.
  *
- * When the trigger level setting in TLR is zero, the SC16IS740/750/760 uses the
+ * When the trigger level setting in TLR is zero, the SC16IS74x/75x/76x uses the
  * trigger level setting defined in FCR. If TLR has non-zero trigger level value
  * the trigger level defined in FCR is discarded. This applies to both transmit
  * FIFO and receive FIFO trigger level setting.
@@ -234,7 +234,7 @@
 #define SC16IS7XX_TLR_TX_TRIGGER(words)	((((words) / 4) & 0x0f) << 0)
 #define SC16IS7XX_TLR_RX_TRIGGER(words)	((((words) / 4) & 0x0f) << 4)
 
-/* IOControl register bits (Only 750/760) */
+/* IOControl register bits (Only 75x/76x) */
 #define SC16IS7XX_IOCONTROL_LATCH_BIT	(1 << 0) /* Enable input latching */
 #define SC16IS7XX_IOCONTROL_MODEM_A_BIT	(1 << 1) /* Enable GPIO[7:4] as modem A pins */
 #define SC16IS7XX_IOCONTROL_MODEM_B_BIT	(1 << 2) /* Enable GPIO[3:0] as modem B pins */
@@ -249,9 +249,9 @@
 #define SC16IS7XX_EFCR_RTS_INVERT_BIT	(1 << 5) /* RTS output inversion */
 #define SC16IS7XX_EFCR_IRDA_MODE_BIT	(1 << 7) /* IrDA mode
 						  * 0 = rate upto 115.2 kbit/s
-						  *   - Only 750/760
+						  *   - Only 75x/76x
 						  * 1 = rate upto 1.152 Mbit/s
-						  *   - Only 760
+						  *   - Only 76x
 						  */
 
 /* EFR register bits */