board: developerbox: move mem_map setup later
dram_init() can't modify global/static variables, so
move the mem_map setup later when bss is available.
Signed-off-by: 
Jassi Brar <jaswinder.singh@linaro.org>
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dram_init() can't modify global/static variables, so
move the mem_map setup later when bss is available.
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>