zcu102: Disconnect carrierboard CLKIN_P1 from zcu102_base/cclk
zcu102: Disconnect carrierboard CLKIN_P1 from zcu102_base/cclk

Fixes synthesis.
zcu102_base/cclk must be tied to *one* package pin.
Need to create a separate clock primitive for CLKIN_P1.
But those pins are for testing, final design should use on-chip
SG-310 oscillator ("REFA").

Signed-off-by: Ola Jeppsson <793f970c52ded1276b9264c742f19d1888cbaf73@adapteva.com>

olajep/oh,parallella/oh,olajep/oh,parallella/oh,olajep/oh,parallella/oh,olajep/oh,parallella/oh