drivers: bluetooth: silabs: Fix indicating support for 2M phy

Previously we always had driver to support 2M PHY regardless of
configuration. As this was fixed the missing support statemenent
caused 2M support to miss regardless of configuration.

Signed-off-by: Petri Pitkanen <petri.pitkanen@silabs.com>

Author: petrip-slab

drivers/bluetooth/hci/Kconfig

@@ -170,6 +170,7 @@ config BT_SILABS_EFR32
 	select BT_CTLR_CONN_RSSI_SUPPORT
 	select BT_CTLR_ADV_EXT_SUPPORT
 	select BT_CTLR_PRIVACY_SUPPORT
+	select BT_CTLR_PHY_2M_SUPPORT
 	help
 	  Use Silicon Labs binary Bluetooth library to connect to the
 	  controller.