feature(shields): Add nice!view

* Use two shield system, nice_view, and nice_view_adapter
* Build system fixes for interconnect use.

app/boards/shields/nice_view/Kconfig.defconfig

@@ -0,0 +1,22 @@
+# Copyright (c) 2022 The ZMK Contributors
+# SPDX-License-Identifier: MIT
+
+if SHIELD_NICE_VIEW
+
+config ZMK_DISPLAY
+	select LVGL_FONT_MONTSERRAT_26
+
+if ZMK_DISPLAY
+
+config SPI
+	default y
+
+config LS0XX
+	default y
+
+config ZMK_WIDGET_WPM_STATUS
+	default y if !ZMK_SPLIT || ZMK_SPLIT_ROLE_CENTRAL
+
+endif # ZMK_DISPLAY
+
+endif

app/boards/shields/nice_view/Kconfig.shield

@@ -0,0 +1,5 @@
+# Copyright (c) 2022 The ZMK Contributors
+# SPDX-License-Identifier: MIT
+
+config SHIELD_NICE_VIEW
+	def_bool $(shields_list_contains,nice_view)

app/boards/shields/nice_view/README.md

@@ -0,0 +1,5 @@
+# nice!view
+
+The nice!view is a low power, high refresh rate display meant to replace I2C OLEDs traditionally used.
+
+This shield requires that an `&nice_view_spi` labelled SPI bus is provided with *at least* MOSI, SCK, and CS pins defined.

app/boards/shields/nice_view/nice_view.conf

@@ -0,0 +1,4 @@
+# Enable nice!view
+CONFIG_ZMK_DISPLAY=y
+CONFIG_LVGL_THEME_DEFAULT_FONT_SMALL_MONTSERRAT_26=y
+CONFIG_LVGL_THEME_DEFAULT_FONT_NORMAL_MONTSERRAT_26=y

app/boards/shields/nice_view/nice_view.overlay

@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2022 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+&nice_view_spi {
+	status = "okay";
+	nice_view: ls0xx@0 {
+		compatible = "sharp,ls0xx";
+		label = "DISPLAY";
+		spi-max-frequency = <1000000>;
+		reg = <0>;
+		width = <160>;
+		height = <68>;
+	};
+};
+
+/ {
+	chosen {
+		zephyr,display = &nice_view;
+	};
+};

app/boards/shields/nice_view/nice_view.zmk.yml

@@ -0,0 +1,8 @@
+file_format: "1"
+id: nice_view
+name: nice!view
+type: shield
+url: https://nicekeyboards.com/nice-view
+requires: [nice_view_header]
+features:
+  - display