i2c: Add Kconfig HAS_I2C_RTIO

This config should be selected by any driver that supports the RTIO
interface and can then be checked on by things like tests or drivers
that subsequently require the feature exist.

Signed-off-by: Tom Burdick <[email protected]>

Author: teburd

drivers/i2c/Kconfig

@@ -54,8 +54,15 @@ config I2C_CALLBACK
 	help
 	  API and implementations of i2c_transfer_cb.
 
+config HAS_I2C_RTIO
+	bool
+	help
+	  This option must be selected by I2C controller drivers that optionally implement the RTIO
+	  interface.
+
 config I2C_RTIO
 	bool "I2C RTIO API"
+	depends on HAS_I2C_RTIO
 	select RTIO
 	help
 	  API and implementations of I2C for RTIO