linux-libc-headers: multilib_header asm/kvm_para.h and asm/bpf_perf_event.h

linux-libc-headers: multilib_header asm/kvm_para.h and asm/bpf_perf_event.h

When building SDK via populate_sdk for qemuarm64 with multilib
enabled, we would have conflict about bits/floatn.h at populate_sdk
time.

  file /usr/include/asm/bpf_perf_event.h conflicts between attempted installs of lib32-linux-libc-headers-dev-4.15.7-r0.armv7vehf_vfp and linux-libc-headers-dev-4.15.7-r0.aarch64
  file /usr/include/asm/kvm_para.h conflicts between attempted installs of lib32-linux-libc-headers-dev-4.15.7-r0.armv7vehf_vfp and linux-libc-headers-dev-4.15.7-r0.aarch64

Apply oe_multilib_header on these header files to fix the problem.

(From OE-Core rev: 89b4e77129990b842e2ca917b98473ec58205e88)

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>