tests: Fix gcov paths for relocated device sources Commit 49ab747f668f421138d5b40d83fa279c4c5e278d moved fdc.c, hd-geometry.c, m48t59.c, tmp105.c into hw/ subdirectories; commit 0ddfaf7fe4c8453446730328bf348b7c6438e4f8 did for mc146818rtc.c. Cc: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Andreas Färber <afaerber@suse.de>