Revert "dt-bindings: clock: renesas: rcar-usb2-clock-sel: Fix typo in example"

This reverts commit f6aa433c.

This is a preparation change for merging android-4.19-q.94 into
msm-4.19 branch.

Remove renesas rcar-usb2-clock-sel bindings from kernel added by [1].
[1] is conflicting against [2] in msm-4.19.

[1] f6aa433c("dt-bindings: clock: renesas: rcar-usb2-clock-sel: Fix typo in example")
[2] 728aba9a("Documentation: devicetree: Remove devicetree bindings from kernel")

Change-Id: I7b0da980eb39cb0aef21ecf12b4f4bbcb0ecc261
Signed-off-by: Ivaylo Georgiev <irgeorgiev@codeaurora.org>