Remove include/batteryservice

Remove global include path for this header. It should
be included with libbatteryservice_headers instead.

Test: builds
Bug: 68724651
Change-Id: Iee06a35a80d4215e239146528fae68a0d4e97607
diff --git a/include/batteryservice b/include/batteryservice
deleted file mode 120000
index 2178c32..0000000
--- a/include/batteryservice
+++ /dev/null
@@ -1 +0,0 @@
-../services/batteryservice/include/batteryservice/
\ No newline at end of file