can: ctucanfd: platform: add missing dependency to HAS_IOMEM

The kernel test robot noticed that the ctucanfd platform driver fails
during modpost on platforms that don't support IOMEM.

| ERROR: modpost: "devm_ioremap_resource" [drivers/net/can/ctucanfd/ctucanfd_platform.ko] undefined!

This patch adds the missing HAS_IOMEM dependency.

Link: https://lore.kernel.org/all/20220523123720.1656611-1-mkl@pengutronix.de
Fixes: e8f0c23a ("can: ctucanfd: CTU CAN FD open-source IP core - platform/SoC support.")
Reported-by: kernel test robot <lkp@intel.com>
Acked-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
Cc: Ondrej Ille <ondrej.ille@gmail.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/ctucanfd/Kconfig

@@ -23,7 +23,7 @@ config CAN_CTUCANFD_PCI
 
 config CAN_CTUCANFD_PLATFORM
 	tristate "CTU CAN-FD IP core platform (FPGA, SoC) driver"
-	depends on OF || COMPILE_TEST
+	depends on HAS_IOMEM && (OF || COMPILE_TEST)
 	select CAN_CTUCANFD
 	help
 	  The core has been tested together with OpenCores SJA1000