[130/251] serial/mxs-auart: increase time to wait for transmitter to become idle

3.6.11.9-rc1 stable review patch. If anyone has any objections, please let me know. -- From: =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= [ Upstream commit 079a036f4283e2b0e5c26080b8c5112bc0cc1831 ] Without this patch the driver waits ~1 ms for the UART to become idle. At 115200n8 this

[130/251] serial/mxs-auart: increase time to wait for transmitter to become idle

3.6.11.9-rc1 stable review patch. If anyone has any objections, please let me know. -- From: =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= u.kleine-koe...@pengutronix.de [ Upstream commit 079a036f4283e2b0e5c26080b8c5112bc0cc1831 ] Without this patch the driver waits ~1 ms for the UART to