powerpc: Add "force config cmd line" Kconfig option
powerpc uses early_init_dt_scan_chosen() from common fdt code. By enabling this option, the common code can take the built in command line over the one that is comming from bootloader / DT. Signed-off-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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