powerpc/64e: Remove unused REGION related macros

Those macros are not used anywhere. Remove them as they are soon
going to be wrong and are not worth modifying as they are not used.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/f0efde8cee0924c3991790042b176ac77ad35e1f.1656427701.git.christophe.leroy@csgroup.eu

arch/powerpc/include/asm/nohash/64/pgtable.h

@@ -57,18 +57,6 @@
 #define IOREMAP_END	(KERN_VIRT_START + KERN_VIRT_SIZE - FIXADDR_SIZE)
 #define FIXADDR_SIZE	SZ_32M
 
-
-/*
- * Region IDs
- */
-#define REGION_SHIFT		60UL
-#define REGION_MASK		(0xfUL << REGION_SHIFT)
-#define REGION_ID(ea)		(((unsigned long)(ea)) >> REGION_SHIFT)
-
-#define VMALLOC_REGION_ID	(REGION_ID(VMALLOC_START))
-#define KERNEL_REGION_ID	(REGION_ID(PAGE_OFFSET))
-#define USER_REGION_ID		(0UL)
-
 /*
  * Defines the address of the vmemap area, in its own region on
  * after the vmalloc space on Book3E