kconfig: define NET_SOCKETS_OFFLOAD_TLS for memfault-sdk

memfault depends on the now removed NET_SOCKETS_OFFLOAD_TLS symbol.

Until an updated memfault sdk is released, we will define the removed
symbol as a promptless symbol so that memfault and compliance can find
it and compliance can pass.

Signed-off-by: Torsten Rasmussen <Torsten.Rasmussen@nordicsemi.no>

Kconfig.nrf

@@ -34,6 +34,12 @@ config WARN_EXPERIMENTAL
 config BOARD_THINGY91_NRF9160_NS
 	bool
 
+# memfault depends on the now removed NET_SOCKETS_OFFLOAD_TLS symbol.
+# Until an updated memfault sdk is released, we define this as a promptless
+# symbol here.
+config NET_SOCKETS_OFFLOAD_TLS
+	bool
+
 # nRF Connect SDK needs a larger default stacks in certain configurations
 #  - For running tests.
 #  - For CC3XX RNG