Change in coreboot[master]: soc/intel/elkhartlake: Implement TSN GbE driver

[Werner Zeh (Code Review)]

Attention is currently required from: Mario Scheithauer.
Werner Zeh has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/63861 )

Change subject: soc/intel/elkhartlake: Implement TSN GbE driver
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Patch Set 2:

(2 comments)

File src/soc/intel/elkhartlake/Kconfig:

https://review.coreboot.org/c/coreboot/+/63861/comment/ef73d16e_75853e0d 
PS2, Line 240: TSN_GBE_DRIVER
Since this would be an elkhart lake spcific driver should we name it EHL_TSN_DRIVER?

File src/soc/intel/elkhartlake/tsn_gbe.c:

https://review.coreboot.org/c/coreboot/+/63861/comment/c5cbe5f0_e8e15f28 
PS2, Line 15: if (!io_mem_base) {
            : 		printk(BIOS_ERR, "TSN GbE: Error can't find I/O MEM resource\n");
            : 		return;
            : 	}
This check is not needed here as it is already done in find_resource() for you. and even more, find_resource() will die() if the resource is missing. So you will never reach this code here and therefore can remove it completely.