efi: Correct .efi rules

These files should have both 'always' and 'targets' so that dependencies
are detected correctly.

When only 'always' is used, the target is built every time, although I am
not quite sure why.

Make sure each has both 'always' and 'targets' to avoid this problem.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/lib/efi_loader/Makefile b/lib/efi_loader/Makefile
index 13a35ea..1a8c8d7 100644
--- a/lib/efi_loader/Makefile
+++ b/lib/efi_loader/Makefile
@@ -23,6 +23,7 @@
 
 ifdef CONFIG_RISCV
 always += boothart.efi
+targets += boothart.o
 endif
 
 ifneq ($(CONFIG_CMD_BOOTEFI_HELLO_COMPILE),)
@@ -32,10 +33,12 @@
 
 ifeq ($(CONFIG_GENERATE_ACPI_TABLE),)
 always += dtbdump.efi
+targets += dtbdump.o
 endif
 
 ifdef CONFIG_EFI_LOAD_FILE2_INITRD
 always += initrddump.efi
+targets += initrddump.o
 endif
 
 obj-$(CONFIG_CMD_BOOTEFI_HELLO) += helloworld_efi.o