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H A Dlpuart_console.Sf1ac79642e0f9a2320f95a8e53042be625a989e0 Tue Jan 15 05:53:03 UTC 2019 Anson Huang <Anson.Huang@nxp.com> imx: add necessary lpuart console_flush callback for debug

Current lpuart driver does NOT implement .console_flush callback,
if debug console is enabled, the console_flush() will call the
undefined .console_flush callback(NULL) for lpuart and leak to
panic, this patch adds .console_flush callback to make lpuart work
for debug mode.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>