package/pkg-generic.mk: create directories upfront in the configure step

package/pkg-generic.mk: create directories upfront in the configure step

We currently create HOST_DIR, TARGET_DIR, STAGING_DIR and BINARIES_DIR
in their respective installation steps. However, as we are about to
change how the logic to capture files installed by packages is
implemented, we will need these directories to exist at the configure
step to keep things simple.

Note that when BR2_PER_PACKAGE_DIRECTORIES=y, the HOST_DIR, TARGET_DIR
and STAGING_DIR are anyway already created at the configure step, when
populating the per-package HOST_DIR and TARGET_DIR. This also means
that we can drop the "mkdir" from per-package-rsync.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
[yann.morin.1998@free.fr:
  - create directories after MESSAGE
  - use $(Q) not @
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>