spi: spidev: drop the incorrect notice from Kconfig

The spidev interface has been de-facto stable for many years. This notice
has been unchanged since 2007 and is incorrect so remove it.
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Link: https://lore.kernel.org/r/20230216123014.110541-1-brgl@bgdev.plSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/Kconfig

@@ -1175,9 +1175,6 @@ config SPI_SPIDEV
 	help
 	  This supports user mode SPI protocol drivers.
 
-	  Note that this application programming interface is EXPERIMENTAL
-	  and hence SUBJECT TO CHANGE WITHOUT NOTICE while it stabilizes.
-
 config SPI_LOOPBACK_TEST
 	tristate "spi loopback test framework support"
 	depends on m