charger: Fix charger pixel format useless

Create HealthdDraw in charger init beforce CreateDisplaySurface,
make sure minui gr_init pixel_format beforce gr_pixel_format.

Bug: 232441376
Test: 1. set ro.minui.pixel_format=ARGB_8888
2. Set a colorful battery_scale.png
3. Power off and enter charger mode.

Change-Id: If16f15d0a8bc3b7cb9dab7392f3753ec0a1525b8