mach-snapdragon: use 1MiB for get_page_table_size()

With 14+ entries in the memory map, we need quite a bit more space for
the page tables.

Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>

arch/arm/mach-snapdragon/board.c

@@ -414,7 +414,7 @@ static void build_mem_map(void)
 
 u64 get_page_table_size(void)
 {
-	return SZ_64K;
+	return SZ_1M;
 }
 
 static int fdt_cmp_res(const void *v1, const void *v2)