lib: nrf_modem rename and move NRF_MODEM_TLS_MAX_MESSAGE_SIZE

Rename NRF_MODEM_TLS_MAX_MESSAGE_SIZE to NRF_SOCKET_TLS_MAX_MESSAGE_SIZE
and move to nrf_socket header.

Signed-off-by: Eivind Jølsgard <[email protected]>

Author: eivindj-nordic

applications/serial_lte_modem/src/http_c/slm_at_httpc.c

@@ -22,7 +22,7 @@ LOG_MODULE_REGISTER(slm_httpc, CONFIG_SLM_LOG_LEVEL);
 #define HTTPC_RES_LEN		256
 #define HTTPC_HEADERS_LEN	512
 #define HTTPC_REQ_LEN		(HTTPC_METHOD_LEN + HTTPC_RES_LEN + HTTPC_HEADER_LEN + 3)
-#define HTTPC_BUF_LEN		2048 /* align with NRF_MODEM_TLS_MAX_MESSAGE_SIZE */
+#define HTTPC_BUF_LEN		NRF_SOCKET_TLS_MAX_MESSAGE_SIZE
 #if HTTPC_REQ_LEN > HTTPC_BUF_LEN
 # error "Please specify larger HTTPC_BUF_LEN"
 #endif