Brandy says she got to tell Whitney Houston how much the singer meant to her right before she died ... and she felt the star was changing for the better. The Grammy winner stopped by "Good Morning America" to discuss her new memoir "Phases" ... and she pulled back the curtain on her final conversation with the music legend -- during which she told Houston just how much the star impacted her. She says she told Houston she inspired her and loved her ... and despite not knowing Houston would soon