ARM: tegra: colibri_t30: fix mcp2515 can controller interrupt polarity

[ Upstream commit 503fcd8464fb6cd18073e97dec59b933930655d6 ]

Fix the MCP2515 SPI CAN controller interrupt polarity which according
to its datasheet defaults to low-active aka falling edge.

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>