SELinux policy: let adbd drop Linux capabilities.

Change-Id: Id41891b89c7b067919cbda06ab97d5eff2ad044f

adbd.te

@@ -3,7 +3,7 @@
 type adbd, domain, mlstrustedsubject;
 allow adbd adb_device:chr_file rw_file_perms;
 allow adbd qemu_device:chr_file rw_file_perms;
-allow adbd self:capability { net_raw setgid setuid dac_override sys_boot sys_admin };
+allow adbd self:capability { net_raw setgid setuid setpcap dac_override sys_boot sys_admin };
 allow adbd rootfs:file { r_file_perms entrypoint };
 allow adbd init:process sigchld;
 allow adbd self:tcp_socket *;