rpmbuild: enable rpmbuild via make rpm

rpmbuild: enable rpmbuild via make rpm

Makefile:
  add make rpm via meson
  rename libnvme -> nvme on Makefile

meson.build, meson_options.txt:
  using former path that nvme provided
  using libdir to be installed right place (32bit -> lib, 64bit -> lib64)

rpmbuild:
  remove unnecessary rpm stages
  since rpm spec file created from meson build
  no need to pacaking it to rpmbuild directory
  build in meson directory
  using rpmbuild directory for install & packaging rpm

Signed-off-by: Steven Seungcheol Lee <sc108.lee@samsung.com>