Add guard for UMA globals

We no longer need these globally. Guard them so we get to declare
static replacements at few locations until complete removal.

Change-Id: Ie33e2a680fc9bbb7e28c8fbe17e5181e626736a5
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/5718
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
intel: Remove GFXUMA and related global variables

Remove use of global variables uma_memory_base and uma_memory_size
from builds with Intel northbridges, as these variables can be kept
within the chipset or even as stack locals.

Intel platforms have no functional implemenation for option GFXUMA.
If we did implement some choice between external and integrated graphics,
it needs to be named in less obscure fashion.

Change-Id: I12f18c4ee6bc89e65a561db6c2b514956f3e2d03
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/5720
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
via/vx900: Remove GFXUMA and use of related global variables

Remove global variables uma_memory_base and uma_memory_size
from builds with via/vx900 northbridge, as these variables can be kept
within the chipset.

Change-Id: I9f8aea4836d81e704eae6a0f2cefc7fd4586b8b8
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/5721
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>