tty: serial: uartlite: Disable clocks in case of errors

In case the uart registration fails the clocks are left enabled.
Disable the clock in case of errors.

Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Link: https://lore.kernel.org/r/20210713064835.27978-2-shubhrajyoti.datta@xilinx.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>