serial: msm_geni_serial: Don't use WARN_ON for console uart

In handler_isr for console uart cases using warn_on for debugging
issues will further lead into the spinlock recursion where the
interrupt routine holds the spinlock and will try to print log
which again needs to acquire the spinlock.
To resolve this recursion issue replaced the warn_on with IPC logs
for console uart.

Change-Id: I6a0a10ff8c14a8ad6c74652f6d4e6e66ffcee13b
Signed-off-by: venkata manasa kakarla <venkka@codeaurora.org>