Change in coreboot[master]: wifi: Add support for new SAR tables revisions

[Sugnan Prabhu S (Code Review)]

Attention is currently required from: Furquan Shaikh, Tim Wawrzynczak, Paul Menzel.
Sugnan Prabhu S has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/56750 )

Change subject: wifi: Add support for new SAR tables revisions
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Patch Set 18:

(1 comment)

File src/vendorcode/google/chromeos/sar.c:

https://review.coreboot.org/c/coreboot/+/56750/comment/1ec78a3f_54ccf41b 
PS17, Line 138: if (CONFIG(USE_SAR)) {
              : 		sar_limits->sar_table->version = 0;
              : 		sar_limits->sar_table->sar_enable = CONFIG(SAR_ENABLE);
              : 		sar_limits->sar_table->dsar_enable = CONFIG(DSAR_ENABLE);
              : 		sar_limits->sar_table->dsar_set_num = CONFIG_DSAR_SET_NUM;
              : 	}
> The generated .hex file size varies based on the following revision choosen in config.star […]

I think as a permanent solution it is better to add "$SAR" in the beginning of the .hex file. The check is required only if the filesize matches 119 or 81.
Let me know what you think.