scripts: use python's hex() in ta_bin_to_c.py

- Python has a built in function to turn a byte into its respective hex
  value that can be used instead of string formatting the values
  directly.
- Using the built in function instead of the previous string formatting
  method fixed an issue where bytes were failing to be written when
  we used an archaic yocto bsp from broadcom.
- The built in function also has the benefit of being easier to read and
  understand.

Signed-off-by: Dhananjay Phadke <dphadke@linux.microsoft.com>
Signed-off-by: Andrew Mustea <andrew.mustea@microsoft.com>
Reviewed-by: Jerome Forissier <jerome.forissier@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>

scripts/bin_to_c.py

@@ -60,7 +60,7 @@ def main():
         if args.text and i != size - 1 and bytes[i] == b'\0':
             print('Error: null byte encountered in text file')
             sys.exit(1)
-        f.write('0x' + '{:02x}'.format(bytes[i]) + ',')
+        f.write(hex(bytes[i]) + ',')
         i = i + 1
         if i % 8 == 0 or i == size:
             f.write('\n')