feat: Update image loading method (BSP-577)

[espressif2022]

ESP-BSP Pull Request checklist

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• Version of modified component bumped
• CI passing

Change description

• Preprocess and load images using esp_mmap_assets and esp_lv_fs

-        lv_img_set_src(img_text, &esp_text);
+        lv_img_set_src(img_text, "A:esp_text.bin");

[igrr]

It is a nice feature, however I don't think it's necessary to use it in BSP examples. The main purpose of BSP examples is to show how to use BSP APIs. They aren't intended to showcase every other possible component which can be used in conjunction with the BSP. At the same time, the fewer dependencies BSPs and BSP examples have, the less often we face issues with build failures or other incompatibilities.