arc: emsdp: Bump RAM size to 16 Mb

On v2 boards that will hit real stock we'll have 16 Mb of RAM.

Note on v1 boards (if anybody ever get one out of trash bin)
this leads to U-Boot execution freeze in the middle ofthe relocation
so don't be surprised.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
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