powerpc: mpc85xx: remove P1_P2_RDB boards

These boards are still non-generic boards:
P1011RDB, P1022RDB, P2010RDB, P2020RDB

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Cc: Poonam Aggrwal <poonam.aggrwal@freescale.com>
42 files changed