microblaze: Cleanup unused functions

These functions haven't been used, so just remove them. The patch
just uses grep to verify.

Signed-off-by: Guo Ren <[email protected]>
Reviewed-by: Anup Patel <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Reviewed-by: Palmer Dabbelt <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Michal Simek <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Michal Simek <[email protected]>

Author: guoren83

arch/microblaze/include/asm/page.h

@@ -35,9 +35,6 @@
 
 #define ARCH_SLAB_MINALIGN	L1_CACHE_BYTES
 
-#define PAGE_UP(addr)	(((addr)+((PAGE_SIZE)-1))&(~((PAGE_SIZE)-1)))
-#define PAGE_DOWN(addr)	((addr)&(~((PAGE_SIZE)-1)))
-
 /*
  * PAGE_OFFSET -- the first address of the first page of memory. With MMU
  * it is set to the kernel start address (aligned on a page boundary).