fs/iso9660: get grub splash from $(TARGET_DIR)

Instead of using directly the splash image from the Buildroot source
directory boot/grub, this commit changes the iso9660 logic to use the
splash image installed in $(TARGET_DIR)/boot/grub.

This effectively allows a user to use a custom splash image by
installing it to $(TARGET_DIR) through a rootfs overlay or using a
post-build script.

Suggested-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

fs/iso9660/iso9660.mk

@@ -11,7 +11,7 @@ ROOTFS_ISO9660_DEPENDENCIES = grub host-cdrkit host-fakeroot linux rootfs-cpio
 
 ifeq ($(BR2_TARGET_GRUB_SPLASH),y)
 define ROOTFS_ISO9660_SPLASHSCREEN
-	$(INSTALL) -D -m 0644 boot/grub/splash.xpm.gz \
+	$(INSTALL) -D -m 0644 $(TARGET_DIR)/boot/grub/splash.xpm.gz \
 		$(ROOTFS_ISO9660_TARGET_DIR)/boot/grub/splash.xpm.gz
 endef
 else