We use IO functions like readl & ioremap_nocache, so include linux/io.h
Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: Hauke Mehrtens <hauke@hauke-m.de>
Patchwork: https://patchwork.linux-mips.org/patch/9650/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>