powerpc: remove orphaned boards mcc200 and prs200

mcc200 and prs200 are old and have no maintainer. Remove the boards.

This also removes the mcc200 specific 1bpp BMP support from
common/lcd.c

Cc: Wolfgang Denk <wd@denx.de>
Cc: Anatolij Gustschin <agust@denx.de>
Cc: Masahiro Yamada <yamada.m@jp.panasonic.com>
Cc: York Sun <yorksun@freescale.com>
Signed-off-by: Nikita Kiryanov <nikita@compulab.co.il>