added a synthesis boundary around indication proxies

Change-Id: Ida14e76e6eabfca4f80b5a4edf38566da7660c85
added a BUFG for the default reset

Change-Id: I7b720ba20fdf33dc8231ca29e4bff4618a5c89cb
added doubleClock and doubleReset to mkPS7

Change-Id: I0838b96a9ba9c68ff3df9b4b29b5d20be2369774
remove extraneous clock and reset

Change-Id: Ib60a0ecf29f61646539515f75a94a0dd1c94a1e4
export PS7LIB and HostType from HostInterface for Zynq

Change-Id: I9d0bb38e84a71ae4d47582473b63440510f29dfe