gdsys: P1022: Fix unused variable warnings

The variables prg_stage2_prepare, prg_stage2_success and prg_stage_fail
are only referenced when CCDM_SECOND_STAGE is set, move these to be by
the existing guard.

Cc: Dirk Eibach <eibach@gdsys.de>
Signed-off-by: Tom Rini <trini@konsulko.com>