System_server: Add support for accessing SMD Device Access

This patch allows system server from accesing smd device. Without this patch
applications were not able to access smd device resulting in failure for
ANT related test cases. Also some system_server permissions wrt Bluetooth
have been moved from bluetooth.te to system_server.te

Change-Id: Id66e82702ee2a3b3a0599d3733c7bfea221041e4
CRs-Fixed: 763090