ARM: at91: sama5d2: configure the L2 cache memory

ARM: at91: sama5d2: configure the L2 cache memory

The SAMA5D2 has a second internal SRAM that can be reassigned as a L2
cache memory.
Make sure it is configured as a L2 cache memory when booting from a SPL
image.

Based on the commit b5ea95ef2b5b from the at91bootstrap repository.

Signed-off-by: Samuel Mescoff <[email protected]>
Reviewed-by: Wenyou Yang <[email protected]>
Reviewed-by: Andreas Bießmann <[email protected]>