arm64: dts: qcom: ifc6560: correct firmware paths

Correct firmware paths for the Inforce IFC6560 to include the SoC name.
Do not include the platform name, since the board uses test-signed
firmware.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220919190037.2122284-4-dmitry.baryshkov@linaro.org