opensbi-payloads: Add dependency on kernel if fdt is set
fdts are built as part of kernel, so add missing dependency on kernel
deploy task
Fixes opensbi build errors
| make: *** No rule to make target '/mnt/b/yoe/master/build/tmp/deploy/images/unmatched/hifive-unmatched-a00.dtb', needed
by '/mnt/b/yoe/master/build/tmp/work/riscv64-yoe-linux-musl/opensbi/0.9+gitAUTOINC+
bd355213bf-r0/git/build/platform/gene
ric/firmware/fw_dynamic.o'. Stop.
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Cc: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
