dt-bindings: bus: Remove unused bindings

dt-bindings: bus: Remove unused bindings

As stated in [1] the Baikal platforms are not supported and
the respective driver code has just been removed. Remove
unused bindings.

Link: https://lore.kernel.org/lkml/22b92ddf-6321-41b5-8073-f9c7064d3432@infradead.org/
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://patch.msgid.link/20260227072726.1142944-3-andriy.shevchenko@linux.intel.com
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>