tty: serial: fsl_lpuart: Add i.MXRT1050 support

[ Upstream commit 443df57b ]

Add support for i.MXRT1050's uart.

Cc: Giulio Benetti <giulio.benetti@benettiengineering.com>
Signed-off-by: Jesse Taube <Mr.Bossman075@gmail.com>
Link: https://lore.kernel.org/r/20211215220538.4180616-8-Mr.Bossman075@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Stable-dep-of: a82c3df9 ("tty: serial: fsl_lpuart: reduce RX watermark to 0 on LS1028A")
Signed-off-by: Sasha Levin <sashal@kernel.org>