winsys/gdi: GDI B5G6R5 display target support
Added RGB_565 support to GDI display target.
This is to fix the color corruption issue when showing 16-bit B5G6R5 framebuffer through GDI.
Closes: #7637 (closed)
Reviewed-by: Jesse Natalie jenatali@microsoft.com
Edited by Weibin Wu