serial: msm_geni_serial: Improve IPC logging in UART driver

Adding extra debugging logs in uart driver to get the exact sequence
from IPC logs so that it will help to debug the issues faster.
Also added error fatal during  dma map fails.

Change-Id: I22555bf6e6a734b768d6d51d1033a1644f493f29
Signed-off-by: Chandana Kishori Chiluveru <cchiluve@codeaurora.org>