net: dsa: Fix dependencies with HSR

The core DSA framework uses hsr_is_master() which would not resolve to a
valid symbol if HSR is built-into the kernel and DSA is a module.

Fixes: 18596f50 ("net: dsa: add support for offloading HSR")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: George McCollister <george.mccollister@gmail.com>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Tested-by: Vladimir Oltean <olteanv@gmail.com>
Link: https://lore.kernel.org/r/20210220051222.15672-1-f.fainelli@gmail.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

net/dsa/Kconfig

@@ -9,6 +9,7 @@ menuconfig NET_DSA
 	tristate "Distributed Switch Architecture"
 	depends on HAVE_NET_DSA
 	depends on BRIDGE || BRIDGE=n
+	depends on HSR || HSR=n
 	select GRO_CELLS
 	select NET_SWITCHDEV
 	select PHYLINK