kernel: add missing config symbols

MPLS feature symbols are normally only set when kmod-mpls is enabled, but the
CONFIG_MPLS symbol they depend on could also have been selected by openvswitch
instead

Signed-off-by: Felix Fietkau <[email protected]>

target/linux/generic/config-5.10

@@ -3515,6 +3515,8 @@ CONFIG_MODULE_UNLOAD=y
 # CONFIG_MPL115_SPI is not set
 # CONFIG_MPL3115 is not set
 # CONFIG_MPLS is not set
+# CONFIG_MPLS_IPTUNNEL is not set
+# CONFIG_MPLS_ROUTING is not set
 # CONFIG_MPTCP is not set
 # CONFIG_MPU3050_I2C is not set
 # CONFIG_MQ_IOSCHED_DEADLINE is not set

target/linux/generic/config-5.15

@@ -3647,6 +3647,8 @@ CONFIG_MODULE_UNLOAD=y
 # CONFIG_MPL115_SPI is not set
 # CONFIG_MPL3115 is not set
 # CONFIG_MPLS is not set
+# CONFIG_MPLS_IPTUNNEL is not set
+# CONFIG_MPLS_ROUTING is not set
 # CONFIG_MPTCP is not set
 # CONFIG_MPU3050_I2C is not set
 # CONFIG_MQ_IOSCHED_DEADLINE is not set