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

Devices/m5stack-tab5/Source/devices/devices_v3.h

@@ -0,0 +1,5 @@
+#pragma once
+
+struct Device;
+
+void tab5_create_devices_v3(Device* i2c0);