MdeModulePkg: Center logo 38.2% from top of screen

Use Microsoft's recommended positioning for the boot logo.

> We recommend that the logo is placed with its center at 38.2% from the
> screen's top edge. This positioning is based on the golden ratio's
> visual aesthetics and matches the Windows 10 design proportions.

Ref: https://learn.microsoft.com/en-us/windows-hardware/drivers/bringup/boot-screen-components#position-the-logo-during-post
Signed-off-by: Tim Crawford <tcrawford@system76.com>

MdeModulePkg/Library/BootLogoLib/BootLogoLib.c

@@ -196,6 +196,12 @@ BootLogoEnableLogo (
         DestY = SizeOfY - Image.Height;
         break;
 
+      case EdkiiPlatformLogoDisplayAttributeMicrosoft:
+        // Position the logo so that its center is 38.2% from the top.
+        DestX = (SizeOfX - Image.Width) / 2;
+        DestY = (SizeOfY * 382) / 1000 - Image.Height / 2;
+        break;
+
       default:
         ASSERT (FALSE);
         continue;