TRX: don't free l1h in trx_phy_inst_close()
TRX: don't free l1h in trx_phy_inst_close()

l1h is allocated in bts_model_phy_instance_set_defaults() and not in
trx_phy_inst_open().  Hence, trx_phy_inst_close() should not free() it!

Change-Id: I0ac4e57a882e5a31143499c1662d8d8e52320938

osmocom/osmo-bts,osmocom/osmo-bts,osmocom/osmo-bts