fix various issues for esp32 (#3007)

* kconfig: Fix invalid dependancy in fsdrv

LV_USE_FS_* symbols are integers, instead of usual booleans.
We must treat them as such.

* ci: Get LVGL version from git tag

* docu: Update Espressif readme

* ci run apt update before installing

scripts/install-prerequisites.sh

@@ -5,4 +5,5 @@
 # here, such as MicroPython and PC simulator packages.
 #
 # Note: This script is run by the CI workflows.
+sudo apt update
 sudo apt install gcc python3 libpng-dev ruby-full gcovr cmake