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/module.cpp

@@ -13,6 +13,7 @@
 #include "devices/detect.h"
 #include "devices/tab5_headphone_detect.h"
 #include "devices/tab5_keyboard.h"
+#include "devices/tab5_keyboard_attach_detect.h"
 #include "devices/tab5_power_control.h"
 #include "devices/tab_5_camera.h"
 
@@ -69,10 +70,12 @@ static error_t start() {
     tab5_camera_init();
     device_listener_add(on_io_expander0_started, nullptr);
     tab5_headphone_detect_start();
+    tab5_keyboard_attach_detect_start();
     return ERROR_NONE;
 }
 
 static error_t stop() {
+    tab5_keyboard_attach_detect_stop();
     tab5_headphone_detect_stop();
     device_listener_remove(on_io_expander0_started);
     tab5_detect_stop();