soc: qcom: Fix smcinvoke_obj->fd assignment

Removed conditional assignment of
smcinvoke_obj->fd. This handles the condition
when fd created in get_uhandle_from_tzhandle is
less than zero.

Change-Id: I824795ba2f14bbf363d86ef21499f71d74f45537
Signed-off-by: Jiten Patel <jitepate@codeaurora.org>