linker: restore prelink support

Prelink support is required to load old vendor binary blobs
on many devices properly

This commit partially reverts 4688279db5dcc4004941e7f133c4a1c3617d842c

 This is the 2nd commit message:

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