dt-bindings: bluetooth: move Bluetooth bindings to dedicated directory

dt-bindings: bluetooth: move Bluetooth bindings to dedicated directory

Some Bluetooth devices bindings are in net/ and some are in
net/bluetooth/, so bring some consistency by putting everything in
net/bluetooth.  Rename few bindings to match preferred naming
style: "vendor,device".

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240811-dt-bindings-serial-peripheral-props-v1-3-1dba258b7492@linaro.org
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>