test/py: describe env__efi_loader_helloworld_file

Describe the components of environment variable
env__efi_loader_helloworld_file.
Signed-off-by: NHeinrich Schuchardt <xypron.glpk@gmx.de>

test/py/tests/test_efi_loader.py

@@ -43,9 +43,10 @@ env__net_static_env_vars = [
 # Details regarding a file that may be read from a TFTP server. This variable
 # may be omitted or set to None if TFTP testing is not possible or desired.
 env__efi_loader_helloworld_file = {
-    'fn': 'lib/efi_loader/helloworld.efi',
-    'size': 5058624,
-    'crc32': 'c2244b26',
+    'fn': 'lib/efi_loader/helloworld.efi', # file name
+    'size': 5058624,                       # file length in bytes
+    'crc32': 'c2244b26',                   # CRC32 check sum
+    'addr': 0x40400000,                    # load address
 }
 """