fix(ble): Turn off coded and 2M phys

The 2M phy caused problems when turning on encryption. I'm also
disabling the coded phy as I don't know it it works and need to first
test it with a phone/central which has support.

Closes #172

epicardium/ble/stack.c

@@ -89,8 +89,8 @@ const LlRtCfg_t _ll_cfg = {
     /*dtmRxSyncMs*/             10000,
 
     /* PHY */
-    /*phy2mSup*/                TRUE,
-    /*phyCodedSup*/             TRUE,
+    /*phy2mSup*/                FALSE,
+    /*phyCodedSup*/             FALSE,
     /*stableModIdxTxSup*/       FALSE,
     /*stableModIdxRxSup*/       FALSE
 };