Fixes & memory optimizations (#540)

- Disable BlueTooth driver by default, to ensure it doesn't allocate memory
- Update BlueTooth settings app behaviour to make sure it starts/stops the devices
- Disable SPI RAM usage for ST7789 as it broke App Hub
- Reduce T-Display and T-Deck display buffers from 1/3rd to 1/10th of resolution
- Enabled dynamic buffers for MbedTLS to optimize memory
- TLS 1.3 did not work with dynamic buffers: downgrade to 1.2 for now
- WiFi is now enabled from the Boot app callback to the WiFi service, instead of the WiFi service start() function. This avoids a lockup when WiFi is started by the service while the Boot app is updating the WiFi settings.

build-tests/Libraries/lvgl/lvgl.pc

@@ -0,0 +1,10 @@
+prefix="/usr/local"
+includedir="${prefix}/include/lvgl"
+libdir=${prefix}/lib
+
+Name: lvgl
+Description: Light and Versatile Graphics Library
+URL: https://lvgl.io/
+Version: 9.4.0
+Cflags: -I${includedir}
+Libs: -L${libdir} -llvgl