[coreboot-gerrit] Change in coreboot[master]: program_loading: Replace prog_rdev() with raw start pointer and size

[Julius Werner (Code Review)]

Attention is currently required from: Furquan Shaikh, Julius Werner.
Julius Werner has removed a vote from this change. ( https://review.coreboot.org/c/coreboot/+/46483 )

Change subject: program_loading: Replace prog_rdev() with raw start pointer and size
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