counter: 104-quad-8: Remove reference in Kconfig to 25-bit counter value

Support for 25-bit counter values was removed in commit 4aa3b75c
("counter: 104-quad-8: Fix race condition between FLAG and CNTR reads").
Adjust the Kconfig description of CONFIG_104_QUAD_8 to remove reference
of 25-bit counter values.

Link: https://lore.kernel.org/r/20230410134516.102886-1-william.gray@linaro.org/Signed-off-by: William Breathitt Gray <william.gray@linaro.org>

drivers/counter/Kconfig

@@ -21,9 +21,9 @@ config 104_QUAD_8
 	  encoder counter/interface device family (104-QUAD-8, 104-QUAD-4).
 
 	  A counter's respective error flag may be cleared by performing a write
-	  operation on the respective count value attribute. Although the
-	  104-QUAD-8 counters have a 25-bit range, only the lower 24 bits may be
-	  set, either directly or via the counter's preset attribute.
+	  operation on the respective count value attribute. The 104-QUAD-8
+	  counters may be set either directly or via the counter's preset
+	  attribute.
 
 	  The base port addresses for the devices may be configured via the base
 	  array module parameter. The interrupt line numbers for the devices may