Implement ext4l_unlink() to delete files from ext4 filesystems. This
enables the 'rm' command to work with ext4l.
The implementation:
- Resolves the parent directory and target file
- Verifies the target is not a directory (use rmdir for that)
- Calls ext4_unlink() to remove the directory entry
- Uses journal transactions for crash safety
Add ext4l_op_ptr() macro to select between ext4l_unlink() and the
fallback based on CONFIG_EXT4_WRITE
Call ext4_commit_super() to ensure the changes are written to disk.
Co-developed-by: Claude <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
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