soc: qmi: dfc: Fix use after free in dfc_svc_init

This change fixes a use after free issue when cleanup is triggered
before dfc client init is completed.
A check is added to both qmi_rmnet_has_client and
qmi_rmnet_has_pending to prevent qmi and port being freed before
the second dfc client is deleted.

Change-Id: I6e37c8e77cee745fabd376f38f0384f364abe5e7
Acked-by: Ning Cai <ncai@qti.qualcomm.com>
Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>