ARM: 8694/1: Remove leftover of fixmap_page_table

fixmap_page_table was removed by commit 836a2418 (ARM: expand
fixmap region to 3MB), but some traces are still there - get rid of
them.
Signed-off-by: NVladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: NRussell King <rmk+kernel@armlinux.org.uk>

arch/arm/include/asm/highmem.h

@@ -18,7 +18,6 @@
 	} while (0)
 
 extern pte_t *pkmap_page_table;
-extern pte_t *fixmap_page_table;
 
 extern void *kmap_high(struct page *page);
 extern void kunmap_high(struct page *page);