bionic: linker: fix prelink support

load_bias_ needs to be calculated from the min_vaddr, not the
prelink address

Fixes

couldn't map "libraryname.so" segment 1: Invalid argument

Change-Id: Ibf1fd1d5a0f2c81ce515f5d47412a043ba768247
fix

Conflicts:

	linker/linker_phdr.cpp
FIXME in bayer lib, Revert "Fix pthread_getattr_np, pthread_attr_setguardsize, and pthread_attr_setstacksize."

This reverts commit b95cf0d23a1db3b7c37bd98b0c86196796c9b029.