tty: serial: Add UART driver for Cortina-Access platform

This driver supports Cortina Access UART IP integrated
in most all CAXXXX line of SoCs. Earlycom is also supported

Signed-off-by: Jason Li <jason.li@cortina-access.com>
Link: https://lore.kernel.org/r/20210615165750.31261-1-alex.nemirovsky@cortina-access.com


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