drivers/intel/wifi: provide weak get_wifi_sar_limits()

Provide a failing get_wifi_sar_limits() to allow SAR Kconfig
options to be selected without relying on CHROMEOS which currently
has the only code to provide SAR data.

Change-Id: I1288871769014f4c4168da00952a1c563015de33
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/19580
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/drivers/intel/wifi/wifi.c

@@ -59,6 +59,12 @@ static int smbios_write_wifi(struct device *dev, int *handle,
 }
 #endif
 
+__attribute__((weak))
+int get_wifi_sar_limits(struct wifi_sar_limits *sar_limits)
+{
+	return -1;
+}
+
 #if IS_ENABLED(CONFIG_HAVE_ACPI_TABLES)
 static void emit_sar_acpi_structures(void)
 {