soc: qcom: qmi_interface: Change qmi send fail to pr_info

QMI send failures can happen rapidly depending on client's usage.
Change the pr_err for send failues to pr_info since these prints can
happen rapidly and flood the kernel log buffer.

Also print the return code on sock_sendmsg for more failure info.

Change-Id: Ia75273fd330f1dcfd4e5023cf439ef18f1a0e0ff
Signed-off-by: Chris Lew <clew@codeaurora.org>