Convert CONFIG_SPL_INIT_MINIMAL et al to Kconfig

This converts the following to Kconfig:
   CONFIG_SPL_INIT_MINIMAL
   CONFIG_SPL_FLUSH_IMAGE
   CONFIG_SPL_SKIP_RELOCATE

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/common/spl/Kconfig b/common/spl/Kconfig
index 50ff113..4268121 100644
--- a/common/spl/Kconfig
+++ b/common/spl/Kconfig
@@ -140,6 +140,20 @@
 
 endmenu
 
+menu "PowerPC SPL specific options"
+	depends on PPC && (SUPPORT_SPL && !SPL_FRAMEWORK)
+
+config SPL_INIT_MINIMAL
+	bool "Arch init code will be built for a very small image"
+
+config SPL_FLUSH_IMAGE
+	bool "Clean dcache and invalidate icache after loading the image"
+
+config SPL_SKIP_RELOCATE
+	bool "Skip relocating SPL"
+
+endmenu
+
 config HANDOFF
 	bool "Pass hand-off information from SPL to U-Boot proper"
 	depends on SPL && BLOBLIST