mlxsw: add psample dependency for spectrum

When PSAMPLE is a loadable module, spectrum must not be built-in:

drivers/net/built-in.o: In function `mlxsw_sp_rx_listener_sample_func':
spectrum.c:(.text+0xe357e): undefined reference to `psample_sample_packet'

This adds a Kconfig dependency to enforce usable configurations.

Fixes: 98d0f7b9 ("mlxsw: spectrum: Add packet sample offloading support")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Yotam Gigi <yotamg@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlxsw/Kconfig

@@ -73,6 +73,7 @@ config MLXSW_SWITCHX2
 config MLXSW_SPECTRUM
 	tristate "Mellanox Technologies Spectrum support"
 	depends on MLXSW_CORE && MLXSW_PCI && NET_SWITCHDEV && VLAN_8021Q
+	depends on PSAMPLE || PSAMPLE=n
 	select PARMAN
 	default m
 	---help---