msm_serial_hs_lite: Use existing uartclk variable for setting clock rate

Currently uartclk rate is hard coded as 7327800 and configured wherever
it is required to get requested baud rate till 460800 bps. To support
higher baud rate above 460800 bps, start using uartclk variable of
uart_port structure which would be having last used uartclk rate value.
Uartclk would be set as ( 16 * required baud rate ) for higher baud rate.
This change doesn't add support for higher baud rate than 460800 bps.

Also do print message cleanup.

Change-Id: Ie3aacf4d334c58d4602f0e412224ca8b4b64d4e7
Signed-off-by: Mayank Rana <mrana@codeaurora.org>