boot: Move OS options into /boot

These options belong in boot/Kconfig since they are not related to
commands. Move them and adjust them to depend on CONFIG_BOOT

Signed-off-by: Simon Glass <sjg@chromium.org>

boot/Kconfig

@@ -393,6 +393,53 @@ config BOOT
 	  is used by commands like bootm, bootz, and booti to effect a boot.
 	  If CMDLINE is disabled, booting is still possible via standard boot.
 
+if BOOT
+
+config BOOTM_LINUX
+	bool "Support booting Linux OS images"
+	depends on BOOT
+	default y
+	help
+	  Support booting the Linux kernel directly via a command such as bootm
+	  or booti or bootz.
+
+config BOOTM_NETBSD
+	bool "Support booting NetBSD (non-EFI) loader images"
+	default y
+	help
+	  Support booting NetBSD via the bootm command.
+
+config BOOTM_OPENRTOS
+	bool "Support booting OPENRTOS / FreeRTOS images"
+	help
+	  Support booting OPENRTOS / FreeRTOS via the bootm command.
+
+config BOOTM_OSE
+	bool "Support booting Enea OSE images"
+	depends on ARM && (ARM64 || CPU_V7A || CPU_V7R) || SANDBOX || PPC || X86
+	help
+	  Support booting Enea OSE images via the bootm command.
+
+config BOOTM_PLAN9
+	bool "Support booting Plan9 OS images"
+	default y
+	help
+	  Support booting Plan9 images via the bootm command.
+
+config BOOTM_RTEMS
+	bool "Support booting RTEMS OS images"
+	default y
+	help
+	  Support booting RTEMS images via the bootm command.
+
+config BOOTM_VXWORKS
+	bool "Support booting VxWorks OS images"
+	default y
+	help
+	  Support booting VxWorks images via the bootm command.
+
+endif  # BOOT
+
 config PXE_UTILS
 	bool
 	select MENU