ltp: fix build with ld-is-gold in DISTRO_FEATURES

* backport one more commit for LD call which conflicts with the
  0001-kvm-use-LD-instead-of-hardcoding-ld.patch we already had
  and replace this 2nd patch with the rebased version which is
  now merged upstream

* then backport additional patch which introduces KVM_LD variable
  which we can set to use .bfd suffix in LD when ld-is-gold is
  in DISTRO_FEATURES to work around gold incompatibility reported:
  https://github.com/linux-test-project/ltp/pull/948#issuecomment-1193138866
  https://lists.openembedded.org/g/openembedded-core/message/168193

  http://errors.yoctoproject.org/Errors/Details/663094/



  x86_64-oe-linux-ld --sysroot=/OE/build/oe-core/tmp-glibc/work/core2-64-oe-linux/ltp/20220527-r0/recipe-sysroot   -z noexecstack -r -T /OE/build/oe-core/tmp-glibc/work/core2-64-oe-linux/ltp/20220527-r0/git/testcases/kernel/kvm/linker/payload.lds --oformat=elf64-x86-64 -o kvm_pagefault01-payload.o kvm_pagefault01-payload.bin
  x86_64-oe-linux-ld: error: kvm_pagefault01-payload.bin:1:1: invalid character
  make: *** [Makefile:53: kvm_pagefault01-payload.o] Error 1

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>