hv_netvsc: rndis_filter needs to select NLS

rndis_filter uses utf8s_to_utf16s() which is provided by setting
NLS, so select NLS to fix the build error:

ERROR: modpost: "utf8s_to_utf16s" [drivers/net/hyperv/hv_netvsc.ko] undefined!

Fixes: 1ce09e8 ("hyperv: Add support for setting MAC from within guests")
Signed-off-by: Randy Dunlap <[email protected]>
Cc: Haiyang Zhang <[email protected]>
Cc: K. Y. Srinivasan <[email protected]>
Cc: Wei Liu <[email protected]>
Cc: Dexuan Cui <[email protected]>
Reviewed-by: Simon Horman <[email protected]>
Tested-by: Simon Horman <[email protected]> # build-tested
Reviewed-by: Michael Kelley <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: rddunlap

drivers/net/hyperv/Kconfig

@@ -3,5 +3,6 @@ config HYPERV_NET
 	tristate "Microsoft Hyper-V virtual network driver"
 	depends on HYPERV
 	select UCS2_STRING
+	select NLS
 	help
 	  Select this option to enable the Hyper-V virtual network driver.