[coreboot] buildrom v2 custom rev support

[Myles Watson]

This simple patch allows v2 to use the custom rev specified by the
user.  It is nearly identical to the same patch for v3, but wasn't
possible until we consolidated the v2 .mk files.

Signed-off-by: Myles Watson <mylesgw at gmail.com>

Thanks,
Myles
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