icnss: Remove WARN_ON

For QMI timeout issues ICNSS_ASSERT macro invokes WARN_ON but
there can be cases of multiple QMI timeouts and those may cause
to spit out lot of WARN_ON message to kernel log. Because of
this, kernel log buffer may overlap and miss logs which may be of
use for debugging the QMI timeout issue. Remove WARN_ON by making
ICNSS_ASSERT as a dummy macro.

Change-Id: I0d5d76a2385f40f64ec5d811f7bcde82f1c44877
CRs-fixed: 2016253
Signed-off-by: Prashanth Bhatta <bhattap@codeaurora.org>