LVGL support for PSRAM

[s-hadinger]

Description:

LVGL will use PSRAM (if present) instead of internal RAM if #define USE_LVGL_PSRAM (enabled by default).

Note: frame-buffer is always allocated in internal RAM because PSRAM is not capable of DMA transfers to SPI.

Checklist:

• The pull request is done against the latest development branch
• Only relevant files were touched
• Only one feature/fix was added per PR and the code change compiles without warnings
• The code change is tested and works on Tasmota core ESP8266 V.2.7.4.9
• The code change is tested and works with core ESP32 V.1.0.6
• I accept the CLA.

NOTE: The code change must pass CI tests. Your PR cannot be merged unless tests pass