arm: dts: k3-*-binman: Make default DM file optional

The default DM firmware path is non-optional as of now. Make it
optional so that users that choose to provide DM via TI_DM argument
instead of BINMAN_INDIRS can do so without build errors.

Signed-off-by: Neha Malcom Francis <n-francis@ti.com>
Reviewed-by: Kamlesh Gurudasani <kamlesh@ti.com>
7 files changed