boot: Add Kconfigs for BOOTMETH_VBE_REQUEST

Allow this to be enabled separately in U-Boot proper and in SPL, since
it is not needed in SPL.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/boot/Kconfig b/boot/Kconfig
index 5f49162..b89916c 100644
--- a/boot/Kconfig
+++ b/boot/Kconfig
@@ -528,6 +528,26 @@
 
 if BOOTMETH_VBE
 
+config BOOTMETH_VBE_REQUEST
+	bool "Support for serving VBE OS requests"
+	default y
+	help
+	  Enables support for looking that the requests made by the
+	  Operating System being booted. These requests result in additions to
+	  the device tree /chosen node, added during the device tree fixup
+	  phase.
+
+config SPL_BOOTMETH_VBE_REQUEST
+	bool "Support for serving VBE OS requests (SPL)"
+	depends on SPL
+	help
+	  Enables support for looking that the requests made by the
+	  Operating System being booted. These requests result in additions to
+	  the device tree /chosen node, added during the device tree fixup
+	  phase.
+
+	  This is only useful if you are booting an OS direct from SPL.
+
 config BOOTMETH_VBE_SIMPLE
 	bool "Bootdev support for VBE 'simple' method"
 	default y