[coreboot] flashrom: Cache probed id:s

[Peter Stuge]

Please see attached fr.cacheprobe_goto.patch.

For those who fiercly advocate against goto; please compare
fr.cacheprobe_goto.patch (which I propose to commit) with the mess in
fr.cacheprobe_if.patch (which is not signed off and only included for
reference) - goto ftw!

Timing:

flashrom r3386: 1.099s
flashrom r3387 (10ms patch): 1.880s
flashrom r3387 + this patch: 0.882s

May be considered petty to optimize away this one second, but it is
quite noticeable, and not neccessary.

//Peter