staging: most: Add dependency to HAS_IOMEM

This patch prevents the module hdm_dim2 from breaking the build in case
HAS_IOMEM is not configured.

Reported-by: <fengguang.wu@intel.com>
Signed-off-by: NChristian Gromm <christian.gromm@microchip.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/most/hdm-dim2/Kconfig

@@ -5,6 +5,7 @@
 config HDM_DIM2
 	tristate "DIM2 HDM"
 	depends on AIM_NETWORK
+	depends on HAS_IOMEM
 
 	---help---
 	  Say Y here if you want to connect via MediaLB to network transceiver.