serial: msm_geni_serial: Add ioctl for sending uart error codes to BT host

Add changes in serial driver to update uart errors. When BT host
driver observes a fault in BT transfers this ioctl needs to be
called. On this ioctl call uart driver will return uart error
to BT host if there are any.

Change-Id: I741b017038b63f1a03aca2169c2190b94b95a15a
Signed-off-by: Chandana Kishori Chiluveru <cchiluve@codeaurora.org>