enb: add QAM64 support for UL

* add new UE feature
* enable in srsue.conf.templ
* add new table for maximum rates
* add config scenario to enable SIB option for QAM64

Change-Id: I6ac2c9989a761e91b93d76c2507f55f0140b202d
diff --git a/sysmocom/scenarios/cfg-enb-enable-ul-qam64.conf b/sysmocom/scenarios/cfg-enb-enable-ul-qam64.conf
new file mode 100644
index 0000000..446c966
--- /dev/null
+++ b/sysmocom/scenarios/cfg-enb-enable-ul-qam64.conf
@@ -0,0 +1,3 @@
+config:
+  enb:
+    enable_ul_qam64: true
\ No newline at end of file