scripts: generate psa key attributes strips to many zeros

Turns out that the string strip function in python doesn't just strip
any occurrence of any sub string which is equal to the string I pass
in but also also any occurrence of any of the characters I pass in to
the function. Replaced the strip function with a function that strips
away only the sub-string I pass in to the function from the beginning
of the string.

Signed-off-by: Even Falch-Larsen <[email protected]>

Author: evenl

scripts/generate_psa_key_attributes.py

@@ -242,7 +242,9 @@ def main() -> None:
     if args.trng_key:
         value  = f'TRNG:{int(math.ceil(args.size / 8))}'
     elif args.key:
-        key = args.key.strip("0x")
+        key = args.key
+        while key.startswith("0x"):
+            key = key.removeprefix("0x")
         if not is_valid_hexa_code(key):
             print("Invalid KEY value")
             return