target/{sdk,imagebuild}: Fix for symlink-tree

With symlink tree some directories are just symlinked which
means IB and SDK end up with a symlink instead of an actual
directory; this fixes the missing files by dereferencesing
the directories instead of copying the symlinks.

Signed-off-by: Daniel Dickinson <lede@cshore.thecshore.com>

target/imagebuilder/Makefile

@@ -26,7 +26,7 @@ $(BIN_DIR)/$(IB_NAME).tar.bz2: clean
 	mkdir -p $(IB_KDIR) $(IB_LDIR) $(PKG_BUILD_DIR)/staging_dir/host/lib \
 		$(PKG_BUILD_DIR)/target $(PKG_BUILD_DIR)/scripts $(IB_DTSDIR)
 	-cp $(TOPDIR)/.config $(PKG_BUILD_DIR)/.config
-	$(CP) \
+	$(CP) -L \
 		$(INCLUDE_DIR) $(SCRIPT_DIR) \
 		$(TOPDIR)/rules.mk \
 		./files/Makefile \

target/sdk/Makefile

@@ -67,7 +67,7 @@ all: compile
 
 $(BIN_DIR)/$(SDK_NAME).tar.bz2: clean
 	mkdir -p $(SDK_BUILD_DIR)/dl $(SDK_BUILD_DIR)/package
-	$(CP) $(INCLUDE_DIR) $(SCRIPT_DIR) $(TOPDIR)/docs $(SDK_BUILD_DIR)/
+	$(CP) -L $(INCLUDE_DIR) $(SCRIPT_DIR) $(TOPDIR)/docs $(SDK_BUILD_DIR)/
 	$(TAR) -cf - -C $(TOPDIR) \
 		`cd $(TOPDIR); find $(KDIR_BASE) -name \*.ko` \
 		`cd $(TOPDIR); find $(KDIR_BASE)/firmware/ -newer $(KDIR_BASE)/firmware/Makefile \