sun50i: move ATF into SRAM A2

On some boards there are issues with SRAM C, so we move ATF to run from
SRAM A2 for now. It actually gives us > 32KB of working space, so a debug
version works here as well.

SRAM A2 is documented to be secure only, which seems like a good fit for
secure monitor runtime code. But apparently this is not really true,
since it's still accessible for the non-secure side.
Also SRAM A2 is tighly coupled to the arisc (OpenRISC controller) and
thus not the ideal place to be hogged with ARM code.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>

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