soc: qcom: glink_smd_xprt: Fix smd close ack for legacy channel

smd_data_ch_close sets local_legacy to false even when close_ack is
not called, this even doesn't allow process_reopen_event to call
close_ack.

smd_data_ch_close set local_legacy to false only when it sends
close_ack, otherwise it will be set to false by process_reopen_event
on sending close_ack.

CRs-Fixed: 1020947
Change-Id: I1353f3a8e625803e6317bc543b7125ce52daa49c
Signed-off-by: Dhoat Harpal <hdhoat@codeaurora.org>