core: arm: generic boot: dt: switch console to /secure-chosen/stdout-path

If CFG_DT=y, check the Device Tree's /secure-chosen node and look for
the stdout-path property. Adjust the console output ac

core: arm: generic boot: dt: switch console to /secure-chosen/stdout-path

If CFG_DT=y, check the Device Tree's /secure-chosen node and look for
the stdout-path property. Adjust the console output accordingly.
The DT bindings for this property have been proposed on the LKML [1].

[1] https://www.spinics.net/lists/arm-kernel/msg566034.html

Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Tested-by: Jerome Forissier <jerome.forissier@linaro.org> (QEMU)
Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>

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core: add common implementation for console_putc() and console_flush()

Since most platforms now use the same console_putc() and
console_flush(), move them to core/kernel/console.c. Make them __weak

core: add common implementation for console_putc() and console_flush()

Since most platforms now use the same console_putc() and
console_flush(), move them to core/kernel/console.c. Make them __weak
so that platforms may still provide their own.
The common code expects the platforms to initialize whatever serial
device from console_init() and call register_console().

Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>

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