rockchip-gpt-img.bbclass: fix dts filename
rockchip-gpt-img.bbclass: fix dts filename

Remove the "${KERNEL_IMAGETYPE}" (i.e. zImage) that preceeded the dts file
since that file no longer has the image-type prepended to it in the deploy
dir.

Signed-off-by: Trevor Woerner <8835777cd84fba3d7873eabbbe1f2de2d3f25b00@gmail.com>

hizukiayaka/meta-rockchip,hizukiayaka/meta-rockchip,hizukiayaka/meta-rockchip