meta-phosphor: Rename btbridged unit

BT stands for Block Transfer, not Bulk. Regardless, a more
recognisable name is IPMI BT Bridge.

Change-Id: Ib1fd4758bb4651ee712388b5fccb13eef1f26a63
Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/common/recipes-phosphor/host-ipmid/btbridged/org.openbmc.HostIpmi.service b/common/recipes-phosphor/host-ipmid/btbridged/org.openbmc.HostIpmi.service
index 60f1e8a..1253bcc 100644
--- a/common/recipes-phosphor/host-ipmid/btbridged/org.openbmc.HostIpmi.service
+++ b/common/recipes-phosphor/host-ipmid/btbridged/org.openbmc.HostIpmi.service
@@ -1,5 +1,5 @@
 [Unit]
-Description=Phosphor Bulk Transfer DBus Bridge
+Description=Phosphor IPMI BT DBus Bridge
 
 [Service]
 Restart=always