fs: ext4: Modify inode-test.c to use KUnit parameterized testing feature

Modify fs/ext4/inode-test.c to use the parameterized testing
feature of KUnit.

Signed-off-by: Arpitha Raghunandan <98.arpi@gmail.com>
Signed-off-by: Marco Elver <elver@google.com>
Reviewed-by: Marco Elver <elver@google.com>
Tested-by: David Gow <davidgow@google.com>
Reviewed-by: David Gow <davidgow@google.com>
Reviewed-by: Iurii Zaikin <yzaikin@google.com>
Acked-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>