refactor(zynqmp): use common code for prepare_dtb

use common code definition and remove zynqmp local definition
for prepare_dtb in dtb flows.

Change-Id: I362b90b96852e9afccc8a2e23d3b7f709280fba7
Signed-off-by: Amit Nagal <amit.nagal@amd.com>
2 files changed