[PATCH 6/8] or1k: Make heap start configurable

[Stefan Wallentowitz]

Previously the heap started right after the bss section. This can now
be configured by changing the _or1k_heap_start symbol that defaults to
the old value (&end). In board_init_early, we can now set this to
another value.

libgloss/Changelog:
    * or1k/sbrk.c: Allow for different heap start

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