drm/imagination: Add reset controller support for GPU initialization

All IMG Rogue GPUs include a reset line that participates in the
power-up sequence. On some SoCs (e.g., T-Head TH1520 and Banana Pi
BPI-F3), this reset line is exposed and must be driven explicitly to
ensure proper initialization.  On others, such as the currently
supported TI SoC, the reset logic is handled in hardware or firmware
without exposing the line directly. In platforms where the reset line is
externally accessible, if it is not driven correctly, the GPU may remain
in an undefined state, leading to instability or performance issues.

This commit adds a dedicated reset controller to the drm/imagination
driver.  By managing the reset line (where applicable) as part of normal
GPU bring-up, the driver ensures reliable initialization across
platforms regardless of whether the reset is controlled externally or
handled internally.

Signed-off-by: Michal Wilczynski <[email protected]>
Reviewed-by: Matt Coster <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Matt Coster <[email protected]>

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