or1k: crt0: use r16 as got pointer
or1k: crt0: use r16 as got pointer

I thought it'd be clever to reuse r2 as got pointer,
since clobbering that would for sure have no effect,
but that will not work since our plt is not
using absolute addresses when compiling for PIE,
so the plt is expecting the got pointer in r16.

skristiansson/uClibc-or1k,skristiansson/uClibc-or1k,skristiansson/uClibc-or1k,skristiansson/uClibc-or1k