soc/amd/common/block/lpc/lpc: report mapped SPI flash as MMIO range

Since the 16MByte of memory-mapped SPI flash region right below the 4GB
boundary is both a fixed region and isn't decoded on a device below the
LPC device, but assumed to be decoded by the LPC device itself, it
shouldn't be reported as a subtractive resource, but as an MMIO resource
instead.

TEST=On mandolin the 16MByte MMIO-mapped SPI flash now show up as a
reserved region in the e820 memory map which wasn't the case before:

13. 00000000ff000000-00000000ffffffff: RESERVED

The Linux kernel doesn't show any new or possibly related errors.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Suggested-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Change-Id: Ib52df2b2d79a1e6213c3499984a5a1e0e25c058a
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74839
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Matt DeVillier <matt.devillier@amd.corp-partner.google.com>
Reviewed-by: Martin L Roth <gaumless@gmail.com>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

0 files changed, 0 insertions, 0 deletions