trivial: drop executable file attribute on source files
-rw-r--r-- 1205 .gitignore
-rw-r--r-- 12350 Makefile
-rw-r--r-- 36373 README.md
-rw-r--r-- 41155 READMEPL.md
drwxr-xr-x - bin
drwxr-xr-x - host_util
drwxr-xr-x - original_u-boot_images
drwxr-xr-x - target_util
drwxr-xr-x - u-boot