dt-bindings: gpu: Rename img,powervr to img,powervr-rogue

dt-bindings: gpu: Rename img,powervr to img,powervr-rogue

This binding will be used for GPUs starting from Series6 (Rogue)
and later. A different binding document will describe Series5.
With that the name "img,powervr" is too generic, rename to
"img,powervr-rogue" to avoid confusion.

Suggested-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Andrew Davis <afd@ti.com>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Frank Binns <frank.binns@imgtec.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Message-ID: <20240109171950.31010-2-afd@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>