Migrate devices, create drivers, other improvements & fixes (#574)

Migrated devices to kernel drivers:

- guition-jc3248w535c
- m5stack-core2
- m5stack-cores3
- m5stack-papers3

New drivers:

- axp192-module
- axp2101-module

Fixes:

- Fix SD card LDO for P4 devices
- Updated PowerOff app to work with kernel displays
- Fix for `lvgl_try_lock()` timing
- Fix for touch events with slow updating displays

Improvements:

- `GuiService` now keeps trying to lock to prevent silent failures caused by drivers.
- `GuiService` now uses lvgl-module calls for locking/unlocking
- display driver now has capability `DISPLAY_CAPABILITY_SLOW_REFRESH`

Drivers/axp192-module/README.md

@@ -0,0 +1,13 @@
+# AXP192 power management IC
+
+A driver for the X-Powers `AXP192` PMIC: DCDC1-3/LDO2-3/EXTEN rail enable and voltage
+control, battery voltage/current/power readback, charge enable/status, and system power off.
+Registers as a `power-supply` child device (voltage, current, is-charging, charge control,
+power off) alongside its own public API for full rail control.
+
+Also includes `axp192-backlight`: a `BACKLIGHT_TYPE` driver for a backlight wired to one of
+the AXP192's rails, declared as a devicetree child node of the `axp192` device it dims. Its
+`rail`, `min-millivolt` and `max-millivolt` properties select the channel and map the 0-255
+brightness level onto that rail's voltage range; brightness level 0 disables the rail outright.
+
+License: [Apache v2.0](LICENSE-Apache-2.0.md)