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.

Cc: Lee Jones <[email protected]>
Acked-by: Linus Walleij <[email protected]>
Reported-by: kernel test robot <[email protected]>
Fixes: 419b3ab ("clk: versatile: remove dependency on ARCH_*")
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Stephen Boyd <[email protected]>

Author: bebarino

drivers/clk/versatile/Kconfig

@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0-only
 
 menu "Clock driver for ARM Reference designs"
+	depends on HAS_IOMEM
 
 config ICST
 	bool "Clock driver for ARM Reference designs ICST"