Samsung Electronics and AMD are extending their smartphone chip agreement. In a press release today, the two companies said they "signed a multi-year agreement extension to bring multiple generations of high-performance, ultra-low-power AMD Radeon graphics solutions to an expanded portfolio of Samsung Exynos SoCs." Even Samsung is reluctant to use Samsung chips these days, so it's not clear what devices these AMD GPUs will actually land in. Samsung's chip division and AMD have already done a generation of an Exynos SoC with an AMD GPU. That chip was the Exynos 2200, with its "Samsung Xclipse 920 GPU" that was co-developed…