mpc85xx: Add support for the P2020

Added various p2020 processor specific details:
* SVR for p2020, p2020E
* immap updates for LAWs and DDR on p2020
* LAW defines related to p2020

Signed-off-by: Srikanth Srinivasan <srikanth.srinivasan@freescale.com>
Signed-off-by: Travis Wheatley <Travis.Wheatley@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
6 files changed