include: configs: j721e_evm: Increase memory offset for tiboot3.bin in HyperFlash

include: configs: j721e_evm: Increase memory offset for tiboot3.bin in HyperFlash

The size of J7200 tiboot3.bin is 516KB but the memory reserved for it in
HyperFlash was 512KB. This led to overlap of tiboot3.bin over tispl.bin
region and break in HyperFlash boot mode.

Therefore, fix this by increasing the memory allocated for tiboot3.bin
to 1MB for J7200.

Fixes: cf1d6867f774 ("board: ti: j7200: Introduce support for j7200 build targets")

Signed-off-by: Aswath Govindraju <a-govindraju@ti.com>
Signed-off-by: Vaishnav Achath <vaishnav.a@ti.com>
Signed-off-by: Anurag Dutta <a-dutta@ti.com>