boot/grub2: fix the installation of target tools

The tools were not installed anymore since we move from autotools to
generic-package. This patch fixes their installation.

We have decided to implement the install tool process by running the "make
install" command for each tuple. This allows to have all different
platforms Grub modules installed in the target. The drawback is the
overwrite of Grub2 binaries tools during each "make install" command. This
drawback is absolutely not important as it happens in the same package. This is
the best option to avoid unnecessary and more complexity to this package.

Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Tested-by: Adam Duskett <aduskett@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

boot/grub2/grub2.mk

@@ -195,5 +195,13 @@ define GRUB2_INSTALL_IMAGES_CMDS
 	)
 endef
 
+ifeq ($(BR2_TARGET_GRUB2_INSTALL_TOOLS),y)
+define GRUB2_INSTALL_TARGET_CMDS
+	$(foreach tuple, $(GRUB2_TUPLES-y), \
+		$(TARGET_MAKE_ENV) $(MAKE) -C $(@D)/build-$(tuple) DESTDIR=$(TARGET_DIR) install
+	)
+endef
+endif
+
 $(eval $(generic-package))
 $(eval $(host-autotools-package))