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The A64 and H5 have a rather generous SRAM C directly adjacent to
SRAM A1, so we can make use of the larger continuous SRAM area to
increase the maximum SPL size.

Move the location of the FEL stack backup buffer up, towards the end of
SRAM C. We restrict ourselves to the slightly tighter requirements of
the H5, to be able to still share the joint swap_buffers data structure.
Signed-off-by: Andre Przywara <osp@andrep.de>