dts: bindings: bluetooth: Add new yaml files for ST SPI protocol V1 and V2

Add "st,hci-spi-v1.yaml" to represent STMicroelectronics SPI protocol V1
which is used by BlueNRG-MS devices.

Add "st,hci-spi-v2.yaml" to show STMicroelectronics SPI protocol V2
utilized by BlueNRG-1 and successor devices.

Signed-off-by: Ali Hozhabri <ali.hozhabri@st.com>