arm64: dts: qcom: qcs404-evb: Change the compatible to distinguish platforms

The compatible flag should be different for each board to match
with the dtb and to let the bootloader pick the appropriate dtb.

Signed-off-by: Khasim Syed Mohammed <khasim.mohammed@linaro.org>
Signed-off-by: Niklas Cassel <niklas.cassel@linaro.org>
Signed-off-by: Andy Gross <agross@kernel.org>