Copy exception vector table to address 0

The exception vector table is located at offset 0 in the barebox image
which gets loaded at address 0x01000000 by the uloader. Hence, the
exception vector table ends up at address 0x01000000. Let's copy it to
address 0 for it to take effect.

Mindzilla Bug 79924

Change-Id: I04f877d9c28f406398f81ed6b51557777cd41e2d
1 file changed