[S] Change in coreboot[master]: {soc/intel/cmn/pcie, mb/google/volteer}: Rename `is_external` variable

[Kapil Porwal (Code Review)]

Attention is currently required from: Tarun Tuli, Eran Mitrani, Kapil Porwal, Nick Vaccaro.

Hello build bot (Jenkins), Tarun Tuli, Eran Mitrani, Subrata Banik, Nick Vaccaro, Eric Lai,

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

https://review.coreboot.org/c/coreboot/+/69970

to look at the new patch set (#3).

Change subject: {soc/intel/cmn/pcie, mb/google/volteer}: Rename `is_external` variable
......................................................................

{soc/intel/cmn/pcie, mb/google/volteer}: Rename `is_external` variable

Name a variable based on its utility. `is_external` variable adds
`ExternalFacingPort` _DSD property to an ACPI device hence
rename it to `add_acpi_external_facing_port`.

BUG=b:259716145
TEST=Build google/rex with this flag and verify it in SSDT at
runtime.

SSDT snippet:
   Name (_DSD, Package (0x04)  // _DSD: Device-Specific Data
   {
       ToUUID ("6211e2c0-58a3-4af3-90e1-927a4e0c55a4"),
       Package (0x01)
       {
           Package (0x02)
           {
               "HotPlugSupportInD3",
               One
           }
       },

ToUUID ("efcc06cc-73ac-4bc3-bff0-76143807c389"),
       Package (0x01)
       {
           Package (0x02)
           {
               "ExternalFacingPort",
               One
           }
        }
    })

Signed-off-by: Kapil Porwal 
Change-Id: I65100283ed9b65037c9890f28ecab41fcfa25d83
---
M src/mainboard/google/volteer/variants/baseboard/devicetree.cb
M src/soc/intel/common/block/pcie/rtd3/chip.h
M src/soc/intel/common/block/pcie/rtd3/rtd3.c
3 files changed, 45 insertions(+), 3 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/70/69970/3