boot: Introduce BOOTSTD_MENU to control bootflow menu build

The bootflow_menu.c code depends on e.g. scene_txt_set_font(),
which is only built when CONFIG_EXPO is enabled. Introduce new
Kconfig symbol BOOTSTD_MENU which depends on EXPO to prevent
triggering errors like these in case e.g. CONFIG_VIDEO=n :

"
boot/bootflow_menu.c:158:(.text+0x8851): undefined reference to `scene_txt_set_font'
"

Make the symbol depend on BOOTSTD_FULL as well to get rid of
the Makefile dependency workaround. Since BOOTSTD_FULL is not
available in SPL, do not define SPL variant of BOOTSTD_MENU.

Fix up bootflow test accordingly.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/boot/Kconfig b/boot/Kconfig
index fe2919f..b168b6b 100644
--- a/boot/Kconfig
+++ b/boot/Kconfig
@@ -469,6 +469,13 @@
 	  standard boot does not support all of the features of distro boot
 	  yet.
 
+config BOOTSTD_MENU
+	bool "Provide a menu of available bootflows for standard boot"
+	depends on BOOTSTD_FULL && EXPO
+	default y
+	help
+	  Provide a menu of available bootflows and related options.
+
 config BOOTSTD_PROG
 	bool "Use programmatic boot"
 	depends on !CMDLINE
diff --git a/boot/Makefile b/boot/Makefile
index b24f806..0e0afad 100644
--- a/boot/Makefile
+++ b/boot/Makefile
@@ -24,6 +24,7 @@
 obj-$(CONFIG_$(PHASE_)BOOTSTD) += bootmeth-uclass.o
 obj-$(CONFIG_$(PHASE_)BOOTSTD) += bootstd-uclass.o
 
+obj-$(CONFIG_$(PHASE_)BOOTSTD_MENU) += bootflow_menu.o
 obj-$(CONFIG_$(PHASE_)BOOTSTD_PROG) += prog_boot.o
 
 obj-$(CONFIG_$(PHASE_)BOOTMETH_EXTLINUX) += bootmeth_extlinux.o
@@ -35,10 +36,6 @@
 obj-$(CONFIG_$(PHASE_)BOOTMETH_SCRIPT) += bootmeth_script.o
 obj-$(CONFIG_$(PHASE_)CEDIT) += cedit.o
 obj-$(CONFIG_$(PHASE_)BOOTMETH_EFI_BOOTMGR) += bootmeth_efi_mgr.o
-ifdef CONFIG_$(PHASE_)BOOTSTD_FULL
-obj-$(CONFIG_$(PHASE_)EXPO) += bootflow_menu.o
-obj-$(CONFIG_$(PHASE_)BOOTSTD) += bootflow_menu.o
-endif
 
 obj-$(CONFIG_$(PHASE_)OF_LIBFDT) += fdt_support.o
 obj-$(CONFIG_$(PHASE_)FDT_SIMPLEFB) += fdt_simplefb.o
diff --git a/test/boot/bootflow.c b/test/boot/bootflow.c
index 154dea7..0d4e966 100644
--- a/test/boot/bootflow.c
+++ b/test/boot/bootflow.c
@@ -857,6 +857,9 @@
 	ofnode node;
 	int i;
 
+	if (!CONFIG_IS_ENABLED(BOOTSTD_MENU))
+		return -EAGAIN;
+
 	ut_assertok(scan_mmc4_bootdev(uts));
 
 	ut_assertok(bootflow_menu_new(&exp));