[FREELDR:PC98] Refactor PC-98 disk access routines

- Fix incorrect IDE controller ownership leading to strange and inconsistent behavior during boot
- Fix a mismatch between the type and flags of the drive
- Remove obsolete definitions
- Use SAL2 annotations

CORE-17977

Author: disean

boot/freeldr/freeldr/arch/i386/pc98/machpc98.c

@@ -57,7 +57,7 @@ Pc98GetBootSectorLoadAddress(IN UCHAR DriveNumber)
         /* 1.44 MB floppy */
         return 0x1FE00;
     }
-    else if (DiskDrive->Type & DRIVE_FDD)
+    else if (DiskDrive->Type == DRIVE_TYPE_FDD)
     {
         return 0x1FC00;
     }