mb/google/brox: enable WIFI_SAR

Add get_wifi_sar_cbfs_filename().  This function uses the FW_CONFIG
for WIFI to choose the right wifi_sar hex file.  Below is the file
mapping:

    wifi_sar_0.hex = wifi6
    wifi_sar_1.hex = wifi7

BUG=b:319302319
BRANCH=None
TEST=emerge-brox coreboot chromeos-bootimage

Change-Id: I212c80412141e7770a512bd8ccf4111963bab395
Signed-off-by: Shelley Chen <shchen@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/80085
Reviewed-by: Nick Vaccaro <nvaccaro@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

0 files changed, 0 insertions, 0 deletions