samples: rust: select AUXILIARY_BUS instead of depending on it

CONFIG_AUXILIARY_BUS cannot be enabled explicitly, and unless we select
it we have no way to include it (and thus to enable the auxiliary driver
sample) unless a driver happens to do it for us.

Fixes: 96609a1 ("samples: rust: add Rust auxiliary driver sample")
Reviewed-by: Greg Kroah-Hartman <[email protected]>
Signed-off-by: Alexandre Courbot <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Danilo Krummrich <[email protected]>

Author: Gnurou

samples/rust/Kconfig

@@ -84,8 +84,8 @@ config SAMPLE_RUST_DRIVER_FAUX
 
 config SAMPLE_RUST_DRIVER_AUXILIARY
 	tristate "Auxiliary Driver"
-	depends on AUXILIARY_BUS
 	depends on PCI
+	select AUXILIARY_BUS
 	help
 	  This option builds the Rust auxiliary driver sample.