Tab5 ST7121 variant + fixes (#605)

Added the newest variant to the tab5, St7121.
Fixed variant detection reliability
Fixed tab5 camera WHO_AM_I failing sometimes
Fixed tab5 keyboard live rotation on boot and after stopping/starting lvgl

Drivers/st7121-module/include/st7121_module.h

@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: Apache-2.0
+#pragma once
+
+#include <tactility/module.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern struct Module st7121_module;
+
+#ifdef __cplusplus
+}
+#endif