[AVR32] Don't use kmap() in flush_icache_page()

flush_icache_page() can be called from atomic context, so we can't
use kmap(). Use page_address() instead.
Signed-off-by: NHaavard Skinnemoen <hskinnemoen@atmel.com>

arch/avr32/mm/cache.c

@@ -121,9 +121,8 @@ void flush_icache_range(unsigned long start, unsigned long end)
 void flush_icache_page(struct vm_area_struct *vma, struct page *page)
 {
 	if (vma->vm_flags & VM_EXEC) {
-		void *v = kmap(page);
+		void *v = page_address(page);
 		__flush_icache_range((unsigned long)v, (unsigned long)v + PAGE_SIZE);
-		kunmap(v);
 	}
 }