arm: Add new config option ARCH_VERY_EARLY_INIT
When this option is set then ARM _main() function would call arch_very_early_init() function at the beginning. It would be before calling any other functions like debug_uart_init() and also before initializing C runtime environment. Signed-off-by:Pali Rohár <pali@kernel.org> Reviewed-by:
Stefan Roese <sr@denx.de>
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