Change in coreboot[master]: arch/x86: Add X86_CUSTOM_BOOTMEDIA

[Raul Rangel (Code Review)]

Attention is currently required from: Martin Roth, Furquan Shaikh, Marshall Dawson, Angel Pons, Andrey Petrov, Patrick Rudolph.
Hello build bot (Jenkins), Martin Roth, Furquan Shaikh, Marshall Dawson, Angel Pons, Andrey Petrov, Patrick Rudolph,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/55853

to look at the new patch set (#2).

Change subject: arch/x86: Add X86_CUSTOM_BOOTMEDIA
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arch/x86: Add X86_CUSTOM_BOOTMEDIA

In order to disable X86_TOP4G_BOOTMEDIA_MAP it requires the definition
to be overridden. This makes it a little less ergonomic to use. Instead
introduce the inverse option that can be selected. I chose to leave
X86_TOP4G_BOOTMEDIA_MAP since it keeps the Makefiles simple.

BUG=b:179699789
TEST=none

Signed-off-by: Raul E Rangel 
Change-Id: I65bbc118bde88687a7d7749c87acf1cbdc56a269
---
M src/arch/x86/Kconfig
M src/soc/intel/apollolake/Kconfig
M src/soc/intel/common/block/fast_spi/Kconfig
3 files changed, 14 insertions(+), 20 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/53/55853/2