ArmPkg/BdsLib: Fixed LinuxImageSize if uImagei format

The uImage is 64Bytes smaller (size of the u-boot header) than
the size of the file read from the file system.



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13030 6f19259b-4bc3-4df7-8a09-765794883524

ArmPkg/Library/BdsLib/BdsLinuxLoader.c

@@ -79,6 +79,7 @@ StartLinux (
   if (*(UINT32*)LinuxKernel == LINUX_UIMAGE_SIGNATURE) {
     // Assume the Image Entry Point is just after the uImage header (64-byte size)
     LinuxKernel = (LINUX_KERNEL)((UINTN)LinuxKernel + 64);
+    LinuxImageSize -= 64;
   }
 
   //TODO: Check there is no overlapping between kernel and Atag