Change in coreboot[master]: sar: Fix semantics of `get_wifi_sar_cbfs_filename()`

[Furquan Shaikh (Code Review)]

Attention is currently required from: Furquan Shaikh, Duncan Laurie.
Hello build bot (Jenkins), Patrick Georgi, Duncan Laurie, Tim Wawrzynczak,

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

https://review.coreboot.org/c/coreboot/+/51485

to look at the new patch set (#6).

Change subject: sar: Fix semantics of `get_wifi_sar_cbfs_filename()`
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sar: Fix semantics of `get_wifi_sar_cbfs_filename()`

Currently, if `get_wifi_sar_cbfs_filename()` returns NULL, then
`get_wifi_sar_limits()` assumes that the default filename is used for
CBFS SAR file. This prevents a board from supporting different models
using the same firmware -- some which require SAR support and some
which don't.

This change updates the logic in `get_wifi_sar_limits()` to return
early if filename is not provided by the mainboard. In order to
maintain the same logic as before, current mainboards are updated to
return WIFI_SAR_CBFS_DEFAULT_FILENAME instead of NULL in default
case.

Change-Id: I68b5bdd213767a3cd81fe41ace66540acd68e26a
Signed-off-by: Furquan Shaikh 
---
M src/include/sar.h
M src/mainboard/google/dedede/variants/drawcia/variant.c
M src/mainboard/google/dedede/variants/galtic/variant.c
M src/mainboard/google/dedede/variants/madoo/variant.c
M src/mainboard/google/dedede/variants/magolor/variant.c
M src/mainboard/google/hatch/variants/dratini/variant.c
M src/mainboard/google/hatch/variants/kindred/variant.c
M src/mainboard/google/octopus/variants/bloog/variant.c
M src/mainboard/google/octopus/variants/bobba/variant.c
M src/mainboard/google/octopus/variants/casta/variant.c
M src/mainboard/google/octopus/variants/fleex/variant.c
M src/mainboard/google/octopus/variants/foob/variant.c
M src/mainboard/google/octopus/variants/meep/variant.c
M src/mainboard/google/octopus/variants/phaser/mainboard.c
M src/mainboard/google/poppy/variants/rammus/mainboard.c
M src/mainboard/google/volteer/variants/lindar/variant.c
M src/mainboard/google/zork/variants/vilboz/variant.c
M src/vendorcode/google/chromeos/sar.c
18 files changed, 49 insertions(+), 82 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/85/51485/6