fix EFI part of "symbols: Generate an xen-sym.map"

Commit 6ea24e53f1 introduced two problems: It left out a semicolon and
typo-ed the source file name of the EFI map file install command.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/Makefile
+++ b/xen/Makefile
@@ -67,7 +67,7 @@ _install: $(TARGET)$(CONFIG_XEN_INSTALL_
 	if [ -r $(TARGET).efi -a -n '$(EFI_DIR)' ]; then \
 		[ -d $(D)$(EFI_DIR) ] || $(INSTALL_DIR) $(D)$(EFI_DIR); \
 		$(INSTALL_DATA) $(TARGET).efi $(D)$(EFI_DIR)/$(T)-$(XEN_FULLVERSION).efi; \
-		$(INSTALL_DATA) $(TARGET)-efi.map $(D)$(DEBUG_DIR)/$(T)-$(XEN_FULLVERSION).efi.map \
+		$(INSTALL_DATA) $(TARGET).efi.map $(D)$(DEBUG_DIR)/$(T)-$(XEN_FULLVERSION).efi.map; \
 		ln -sf $(T)-$(XEN_FULLVERSION).efi $(D)$(EFI_DIR)/$(T)-$(XEN_VERSION).$(XEN_SUBVERSION).efi; \
 		ln -sf $(T)-$(XEN_FULLVERSION).efi $(D)$(EFI_DIR)/$(T)-$(XEN_VERSION).efi; \
 		ln -sf $(T)-$(XEN_FULLVERSION).efi $(D)$(EFI_DIR)/$(T).efi; \