feat(png) use lv_png

Author: amirgon

.gitmodules

@@ -4,6 +4,3 @@
 [submodule "micropython/pycparser"]
 	path = pycparser
 	url = https://github.com/eliben/pycparser.git
-[submodule "driver/png/lodepng"]
-	path = driver/png/lodepng
-	url = https://github.com/lvandeve/lodepng.git

driver/js/imagetools.py

@@ -9,7 +9,6 @@
 sys.path.append('') # See: https://github.com/micropython/micropython/issues/6419
 
 import lvgl as lv
-from imagetools import get_png_info, open_png
 import display_driver_utils
 
 # Init
@@ -23,12 +22,6 @@
 except NameError: 
     script_path = ''
 
-# Register an image decoder
-
-decoder = lv.img.decoder_create()
-decoder.info_cb = get_png_info
-decoder.open_cb = open_png
-
 # Load the image
 
 with open('%s/png_decoder_test.png' % script_path, 'rb') as f: