ARM: dts: msm: Disable SPI CAN controller on msm8996 CV2X boards

Disable the SPI based CAN controller on msm8996 CV2X boards
since they are using the USB based CAN controller now.

Change-Id: I57cccee0b9ffa59f516747350160907960048a6a
Signed-off-by: Gustavo Solaira <gustavos@codeaurora.org>