arm64: defconfig: enable clock driver for ZynqMP platforms

The Zynqmp Ultrascale clock controller generates clocks for peripherals
by default. So enable this clock driver for ZynqMP platforms.

Signed-off-by: Quanyang Wang <quanyang.wang@windriver.com>
Link: https://lore.kernel.org/r/20201209021416.1017790-1-quanyang.wang@windriver.com


Signed-off-by: Michal Simek <michal.simek@xilinx.com>