arm64: pgtable: Correct typo in comment

vmmemmap -> vmemmap
Signed-off-by: NMark Brown <broonie@kernel.org>
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>

arch/arm64/include/asm/pgtable.h

@@ -17,7 +17,7 @@
  * VMALLOC range.
  *
  * VMALLOC_START: beginning of the kernel vmalloc space
- * VMALLOC_END: extends to the available space below vmmemmap, PCI I/O space
+ * VMALLOC_END: extends to the available space below vmemmap, PCI I/O space
  *	and fixed mappings
  */
 #define VMALLOC_START		(MODULES_END)