Revert "[llvm-objcopy] -O binary: do not align physical addresses"

This reverts commit eb1442d0.

The test tools/llvm-objcopy/ELF/binary-paddr.test fails on
ppc64be-clang-test-suite:
https://lab.llvm.org/buildbot#builders/231/builds/13120

Reverting at author's request.