[nrf noup] lib: os: zvfs: Remove EXPERIMENTAL from ZVFS

Although ZVFS is experimental, the warning is annoying the matter team.
Therefore, remove the experimental selection.

This may be reverted once upstream unselects experimental.

Signed-off-by: Bjarki Arge Andreasen <bjarki.andreasen@nordicsemi.no>

lib/os/zvfs/Kconfig

@@ -6,7 +6,6 @@
 menuconfig ZVFS
 	bool "Zephyr virtual filesystem (ZVFS) support [EXPERIMENTAL]"
 	select FDTABLE
-	select EXPERIMENTAL
 	help
 	  ZVFS is a central, Zephyr-native library that provides a common interoperable API for all
 	  types of file descriptors such as those from the non-virtual FS, sockets, eventfds, FILE *'s