The following adds a helper for matching the linux,stdout-path property
in the chosen node and makes use of it in the i.MX serial and Atmel serial driver.

changes since v4:

 - add option support and check stdout-path too

changes since v3:

- move code from separate files to drivers/of/base.c and include/linux/of.h

changes since v2:

- move helper to OF core and make it independent of serial devices

changes since v1:

- move it out of the i.MX serial driver and make it generic for serial
  devices.

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