twrpme: add markdown for Mi 8 Pro and Mi 8 EE

Also add xiaomi unlock instructions for beryllium

Change-Id: I205ad50678086a7cad71e6165b811d404b15e228
diff --git a/_xiaomi/xiaomipocophonef1.markdown b/_xiaomi/xiaomipocophonef1.markdown
index 0ae360c..0980955 100644
--- a/_xiaomi/xiaomipocophonef1.markdown
+++ b/_xiaomi/xiaomipocophonef1.markdown
@@ -15,6 +15,8 @@
 
 {% include dmverity.html %}
 
+{% include xiaomiunlock.html %}
+
 {% include appinstall.html %}
 
 {% include download.html %}