atmel_serial: use existing console options only if BRG is running
If BRGR is zero, the baud rate generator isn't running, so the boot loader can't have initialized the port. Signed-off-by: NHaavard Skinnemoen <hskinnemoen@atmel.com> Acked-by: NAndrew Victor <linux@maxim.org.za> Tested-by: NMarc Pignat <marc.pignat@hevs.ch> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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