microblaze: Support 4k/16k/64k pages

Add support for page size which is supported by MMU.
Remove 8k and 32k page size because they are not supported
by MMU.

Signed-off-by: Michal Simek <monstr@monstr.eu>
diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig
index ab9afca..6133bed 100644
--- a/arch/microblaze/Kconfig
+++ b/arch/microblaze/Kconfig
@@ -243,14 +243,11 @@
 config MICROBLAZE_4K_PAGES
 	bool "4k page size"
 
-config MICROBLAZE_8K_PAGES
-	bool "8k page size"
-
 config MICROBLAZE_16K_PAGES
 	bool "16k page size"
 
-config MICROBLAZE_32K_PAGES
-	bool "32k page size"
+config MICROBLAZE_64K_PAGES
+	bool "64k page size"
 
 endchoice