powerpc: delete Wind River SBC8560/8540 support

The sbc8548/60 (both similar, just variations in UART hardware)
support has been removed from the linux kernel as of v3.6-rc1~132
so lets also now remove it from the u-boot tree as well.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
10 files changed