[UART] keep the afe enabled in interrupt handler

do not disable autoflow control in BT recieve interrupt handler.
though we re-enable it at watermark of 150 bytes,
this should avoid and be at a safer side for fifo overrun corner cases.

[bug: 17870872]

Change-Id: I4b34f6dd3680d1a88f31fe0afa9effff838d8b15
Signed-off-by: oza pawandeep <oza@broadcom.com>
1 file changed