UPSTREAM: clk: versatile: Depend on HAS_IOMEM

kbuild robot reports that s390 fails to build this driver with
COMPILE_TEST. Let's depend on HAS_IOMEM so that s390 doesn't try to
build it.

Bug: 254441685
Cc: Lee Jones <lee.jones@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Reported-by: kernel test robot <lkp@intel.com>
Fixes: 419b3ab6 ("clk: versatile: remove dependency on ARCH_*")
Link: https://lore.kernel.org/r/20210604192321.2594519-1-sboyd@kernel.org


Signed-off-by: Stephen Boyd <sboyd@kernel.org>
(cherry picked from commit 51c8b497)
Signed-off-by: Lee Jones <joneslee@google.com>
Change-Id: Id145c82b310a876b5a42f48c39c18fef36c2ad31