mlxsw: spectrum: Rename the firmware file

Change the firmware file name to be in "mellanox" directory.

This commit is a followup to the linux-firmware commit a4c72696f5f4
("Mellanox: Add firmware for mlxsw_spectrum")
Signed-off-by: NYotam Gigi <yotamg@mellanox.com>
Reviewed-by: NIdo Schimmel <idosch@mellanox.com>
Signed-off-by: NJiri Pirko <jiri@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlxsw/spectrum.c

@@ -81,7 +81,7 @@ static const struct mlxsw_fw_rev mlxsw_sp_supported_fw_rev = {
 };
 
 #define MLXSW_SP_FW_FILENAME \
-	"mlxsw_spectrum-" __stringify(MLXSW_FWREV_MAJOR) \
+	"mellanox/mlxsw_spectrum-" __stringify(MLXSW_FWREV_MAJOR) \
 	"." __stringify(MLXSW_FWREV_MINOR) \
 	"." __stringify(MLXSW_FWREV_SUBMINOR) ".mfa2"