riscv: dts: binman.dtsi: Drop filename property for proper U-Boot

Drop filename property for proper U-Boot entry since binman takes
"u-boot-nodtb.bin" as the default filename for u-boot-nodtb entries.

This follows efe9c12322b ("riscv: dts: binman.dtsi: Switch to
u-boot-nodtb entry for proper U-Boot") to clean binman.dtsi up.

Signed-off-by: Yao Zi <ziyao@disroot.org>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
1 file changed