style: Fix PEP8 blank lines issues in Python files

Done with `autopep8 --select=E3,W3`, fixes:

- E301 - Add missing blank line.
- E302 - Add missing 2 blank lines.
- E303 - Remove extra blank lines.
- E304 - Remove blank line following function decorator.
- E309 - Add missing blank line.
- W391 - Remove trailing blank lines.

tools/scripts/file-hex-array.py

@@ -2,6 +2,7 @@ import binascii
 import os.path
 import sys
 
+
 def tof(filepath):
     with open(filepath, 'r') as f:
         content = f.read()
@@ -15,6 +16,7 @@ def tof(filepath):
     print(os.path.basename(filepath) + ".file created.")
     exit(0)
 
+
 def toa(filepath):
     with open(filepath, 'rb') as f:
         content = f.read()
@@ -28,6 +30,7 @@ def toa(filepath):
     print(os.path.basename(filepath) + ".array created.")
     exit(0)
 
+
 def usage():
     print("========================================================\n\
 #\n\