Revert "dt-bindings: can: mcp251x: add mcp25625 support"

This reverts commit 33672c74.

This is a preparation change for merging android-4.19.59 into
msm-4.19 branch.

[1] can be reverted because it is not related to arm
and it is conflicting against [2] in msm-4.19.

[1] 33672c74("dt-bindings: can: mcp251x: add mcp25625 support")
[2] 728aba9a("Documentation: devicetree: Remove devicetree bindings from
kernel")

Change-Id: I63fcf16a8e6e9cbaa6a936f16a6c1a16698a3c0c
Signed-off-by: Ivaylo Georgiev <irgeorgiev@codeaurora.org>