[LinuxBIOS] patch to lib/lar.c and include/lar.h

[ron minnich]

These changes are needed to allow initram to chain to subsequent
stage1 phases, per the earlier discussion.

The chaining is needed since initram is going to call disable_car,
which may, among other things, move the stack around
or even lose the contents of stack. Support a return from disable_car
is a very difficult proposition.

The intent is that I can do this:
ret = execute_in_place(&archive, "normal/initram/segment0", main_ram_working);
or similar and thus chain from initram to the second part of main,
with a new stack and working dram.

ron
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