[coreboot] [PATCH] Fix bayou payload execution

[Ulf Jordan]

Bayou svn HEAD cannot execute its payloads correctly, due to payloads 
overwriting bayou in memory. This is in turn due to the lpgcc link run 
trying to apply both libpayload's and bayou's ldscripts.

The two attached patches a) makes lpgcc's choice of ldscript overridable 
and b) adjusts bayou's ldscript to work with the recent MB changes in 
libpayload.

Compile and runtime tested with bayou, coreinfo and coreboot-v3 in QEMU.

/ulf