Fix a warning from init.

init: Unable to set property 'ro.debuggable' to '1' in
property file '/vendor/build.prop': Read-only property
was already set

ro.debuggable is set automatically by the build type, it does not need
to be explicitly set anywhere else.

Bug: 110097226
Change-Id: I021a0d1cdfab8db5de846d6863813f6ad7916422
diff --git a/shared/device.mk b/shared/device.mk
index 8714f73..6aaabe4 100644
--- a/shared/device.mk
+++ b/shared/device.mk
@@ -25,7 +25,6 @@
     ro.carrier=unknown \
     ro.com.android.dataroaming=false \
     ro.com.google.locationfeatures=1 \
-    ro.debuggable=1 \
     ro.hardware.virtual_device=1 \
     ro.logd.size=1M \
     ro.opengles.version=131072 \