drm/v3d: Allocate all resources before enabling the clock

drm/v3d: Allocate all resources before enabling the clock

Move all resource allocation operations before actually enabling the
clock, as those operations don't require the GPU to be powered on.

This is a preparation for runtime PM support. The next commit will
move all code related to powering on and initiating the GPU into the
runtime PM resume callback and all resource allocation will happen
before resume().

Reviewed-by: Melissa Wen <mwen@igalia.com>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Link: https://patch.msgid.link/20260331-v3d-power-management-v9-2-f52ff87bfd36@igalia.com
Signed-off-by: Maíra Canal <mcanal@igalia.com>