tee: Pass a pointer to virt_to_page()

Like the other calls in this function virt_to_page() expects
a pointer, not an integer.

However since many architectures implement virt_to_pfn() as
a macro, this function becomes polymorphic and accepts both a
(unsigned long) and a (void *).

Fix this up with an explicit cast.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>

drivers/tee/tee_shm.c

@@ -32,7 +32,7 @@ static int shm_get_kernel_pages(unsigned long start, size_t page_count,
 			 is_kmap_addr((void *)start)))
 		return -EINVAL;
 
-	page = virt_to_page(start);
+	page = virt_to_page((void *)start);
 	for (n = 0; n < page_count; n++) {
 		pages[n] = page + n;
 		get_page(pages[n]);