sandbox: Move BSS after EFI sections

Something went wrong when writing the sandbox linker scripts and so we
ended up with a .bss section marker right before the efi runtime sections.

That obviously is a terrible idea, as it may result in overwriting efi
runtime code and data. So let's move the .bss identifier behind the efi
sections.

Signed-off-by: Alexander Graf <agraf@suse.de>

arch/sandbox/cpu/u-boot.lds

@@ -17,9 +17,7 @@ SECTIONS
 	_u_boot_sandbox_getopt : { *(.u_boot_sandbox_getopt) }
 	__u_boot_sandbox_option_end = .;
 
-	__bss_start = .;
-
-		.__efi_runtime_start : {
+	.__efi_runtime_start : {
 		*(.__efi_runtime_start)
 	}
 
@@ -48,6 +46,7 @@ SECTIONS
 		*(.__efi_runtime_rel_stop)
 	}
 
+	__bss_start = .;
 }
 
 INSERT BEFORE .data;