arm64: dts: qcom: qcs6490-rb3gen2: Enable CAN bus controller

arm64: dts: qcom: qcs6490-rb3gen2: Enable CAN bus controller

Enable the MCP2518FD CAN controller on the QCS6490 RB3 Gen2 platform.
The controller is connected via SPI3 and uses a 40 MHz oscillator.

Signed-off-by: Viken Dadhaniya <viken.dadhaniya@oss.qualcomm.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20260403-can-spi-kodiak-dtsi-v1-1-4055e67dd3fc@oss.qualcomm.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>