Fix AMD UMA for RS780

In commit 6b5eb1cc2d1702ff10cd02249d3d861c094f9118 setup of
UMA memory region was moved to happen at a later state and
this broke UMA with RS780 southbridge.

Share the TOP_MEM and UMA settings before any of the PCI or CPU
scanning takes place.

Change-Id: I9cae1fc2948cbccede58d099faf1dfe49e9df303
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/1488
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-by: Dave Frodin <dave.frodin@se-eng.com>
Reviewed-by: Anton Kochkov <anton.kochkov@gmail.com>
7 files changed