platform: cznic: CZNIC_PLATFORMS should depend on ARCH_MVEBU

CZ.NIC's Turris devices are based on Marvell EBU SoCs.  Hence add a
dependency on ARCH_MVEBU, to prevent asking the user about these drivers
when configuring a kernel that cannot run on an affected CZ.NIC Turris
system.

Fixes: 992f1a3 ("platform: cznic: Add preliminary support for Turris Omnia MCU")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Author: geertu

drivers/platform/cznic/Kconfig

@@ -6,6 +6,7 @@
 
 menuconfig CZNIC_PLATFORMS
 	bool "Platform support for CZ.NIC's Turris hardware"
+	depends on ARCH_MVEBU || COMPILE_TEST
 	help
 	  Say Y here to be able to choose driver support for CZ.NIC's Turris
 	  devices. This option alone does not add any kernel code.