[coreboot] Fix custom configuration strings

[Myles Watson]

This patch fixes a typo in config/payloads/payloads.conf so that the
value of PAYLOAD-y gets put into custom config strings, not the string
PAYLOAD-y.  It borders on trivial.

Thanks,
Myles

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