MdeModulePkg: When media_change happens at Partition.Start(), the lower driver (ScsiD...

MdeModulePkg: When media_change happens at Partition.Start(), the lower driver (ScsiDisk) should immediately return EFI_MEDIA_CHANGE but not EFI_SUCCESS. This way is used to avoid the interrupted Partition.Start() closes those opened protocols(DiskIo and DevicePath protocol) who are using by the re-entered partition driver at the same handle.

Signed-off-by: erictian
Reviewed-by: rsun3
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13082 6f19259b-4bc3-4df7-8a09-765794883524