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Several RISC-V boards feature Imagination GPUs that are compatible with the PowerVR driver. An example is the IMG BXM-4-64 GPU on the Lichee Pi 4A board. This commit adjusts the driver's Kconfig dependencies to allow the PowerVR driver to be compiled on the RISC-V architecture. By enabling compilation on RISC-V, we expand support for these GPUs, providing graphics acceleration capabilities and enhancing hardware compatibility on RISC-V platforms. The RISC-V support is restricted to 64-bit systems (RISCV && 64BIT) as the driver currently has an implicit dependency on a 64-bit platform. Add a dependency on MMU to fix a build warning on RISC-V configurations without an MMU. Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org> Reviewed-by: Matt Coster <matt.coster@imgtec.com> Signed-off-by: Michal Wilczynski <m.wilczynski@samsung.com> Link: https://lore.kernel.org/r/20250822-apr_14_for_sending-v13-4-af656f7cc6c3@samsung.com Signed-off-by: Matt Coster <matt.coster@imgtec.com>