Move adbd to an apex.

Test: adb shell "su 0 readlink /proc/\`pidof adbd\`/exe"
Change-Id: I84dfe4d1b28b619f98c03a2c8eeef2c783d30af2
diff --git a/adb/apex/com.android.adbd.x509.pem b/adb/apex/com.android.adbd.x509.pem
new file mode 100644
index 0000000..bb85c1d
--- /dev/null
+++ b/adb/apex/com.android.adbd.x509.pem
@@ -0,0 +1,35 @@
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+-----END CERTIFICATE-----