Power consumption fields not available on creation forms

[lampwins]

Environment

• Python version: 3.7
• NetBox version: develop-2.6

Steps to Reproduce

1. Create a device or device type
2. Click the button to create a new Power Port

Expected Behavior

The creation form for a Power Port should include the power consumption fields maximum_draw and allocated_draw.

Observed Behavior

These fields are not available on the creation form, only the edit form on a device, or not at all for a device type because they cannot be edited.