treewide: Fix iomap resource size miscalculations

Convert off-by-1 r->end - r->start to resource_size(r)

Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: David Brown <davidb@codeaurora.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Florian Fainelli <florian@openwrt.org>
Acked-by: Wim Van Sebroeck <wim@iguana.be>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>