armv8: add lowlevel_init.S
For boards that call s_init() when the SPL runs, we are expected to setup an early stack before calling this C function. Implement the proper AArch64 version of this based on the ARMv7 code. This allows sunxi boards to setup the basic peripherals even with a 64-bit SPL. Signed-off-by: NAndre Przywara <andre.przywara@arm.com> Reviewed-by: NSimon Glass <sjg@chromium.org> Reviewed-by: NJagan Teki <jagan@openedev.com>
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