tty: xilinx_uartps: Update copyright text to correct format

Based on recommended guidance Copyright term should be also present in
front of (c). That's why aligned drivers to match this pattern.
It helps automated tools with source code scanning.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Link: https://lore.kernel.org/r/20220729114748.18332-3-shubhrajyoti.datta@xilinx.com


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