NET_DSA_NETC_SWITCH selects NXP_NTMP, NXP_NETC_LIB and FSL_ENETC_MDIO,
but these symbols depend on NET_VENDOR_FREESCALE which may not be
enabled. This results in Kconfig warnings and linker errors like:

  undefined reference to `ntmp_bpt_update_entry'
  undefined reference to `ntmp_fdbt_search_port_entry'
  undefined reference to `ntmp_free_cbdr'
  undefined reference to `enetc_hw_alloc'
  ...

Therefore, add "depends on NET_VENDOR_FREESCALE" to NET_DSA_NETC_SWITCH,
ensuring that the selected symbols NXP_NTMP, NXP_NETC_LIB and
FSL_ENETC_MDIO, which all depend on NET_VENDOR_FREESCALE, can only be
selected when that dependency is already satisfied.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202605240046.8MvKuOMg-lkp@intel.com/
Closes: https://lore.kernel.org/oe-kbuild-all/202605240706.EuGmnrz5-lkp@intel.com/
Fixes: 187fbae024c8 ("net: dsa: netc: introduce NXP NETC switch driver for i.MX94")
Signed-off-by: Wei Fang <wei.fang@nxp.com>
---
 drivers/net/dsa/netc/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/dsa/netc/Kconfig b/drivers/net/dsa/netc/Kconfig
index d2f78d74ac23..793f7691a24f 100644
--- a/drivers/net/dsa/netc/Kconfig
+++ b/drivers/net/dsa/netc/Kconfig
@@ -3,6 +3,7 @@ config NET_DSA_NETC_SWITCH
 	tristate "NXP NETC Ethernet switch support"
 	depends on ARM64 || COMPILE_TEST
 	depends on NET_DSA && PCI
+	depends on NET_VENDOR_FREESCALE
 	select NET_DSA_TAG_NETC
 	select FSL_ENETC_MDIO
 	select NXP_NTMP
-- 
2.34.1