tty: serial: uartps: Add support for uartps controller reset

Add support for an optional reset for the uartps controller using
the reset driver. If the uartps node contains the "resets" property,
then cdns_uart_startup performs uartps controller non-pulse out of reset
and reset in exit path.

Signed-off-by: Manikanta Guntupalli <manikanta.guntupalli@amd.com>
Link: https://lore.kernel.org/r/20240425062358.1347684-4-manikanta.guntupalli@amd.com


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