[nrf noup] snippets: Add snippet for the Zephyr Bluetooth Controller

By defining this snippet it becomes simpler to build an application
for the Zephyr Bluetooth Controller as it removes the need
for adding boilerplate overlay files to applications.

This snippet is only needed in NCS because the SoftDevice
Controller is the default and supported controller.

Signed-off-by: Rubin Gerritsen <[email protected]>

snippets/bt-ll-sw-split/README.rst

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+.. _snippet-bt-ll-sw-split:
+
+Zephyr Bluetooth LE Controller (bt-ll-sw-split)
+###############################################
+
+.. code-block:: console
+
+   west build -S bt-ll-sw-split [...]
+
+Overview
+********
+
+This snippet changes the default Bluetooth controller to the Zephyr Bluetooth LE Controller.
+
+Requirements
+************
+
+Hardware support for:
+
+- :kconfig:option:`CONFIG_BT`
+- :kconfig:option:`CONFIG_BT_CTLR`

snippets/bt-ll-sw-split/bt-ll-sw-split.conf

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+CONFIG_BT=y
+CONFIG_BT_CTLR=y
+CONFIG_BT_LL_SW_SPLIT=y

snippets/bt-ll-sw-split/bt-ll-sw-split.overlay

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+&bt_hci_controller {
+	status = "okay";
+};
+
+&bt_hci_sdc {
+	status = "disabled";
+};
+
+/ {
+	chosen {
+		zephyr,bt-hci = &bt_hci_controller;
+	};
+};

snippets/bt-ll-sw-split/snippet.yml

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+name: bt-ll-sw-split
+append:
+  EXTRA_CONF_FILE: bt-ll-sw-split.conf
+  EXTRA_DTC_OVERLAY_FILE: bt-ll-sw-split.overlay