drm/vc4: hvs: Rename hvs_regs list

drm/vc4: hvs: Rename hvs_regs list

The HVS register set has been heavily modified in the BCM2712, and we'll
thus need a separate debugfs_reg32 array for it.

The name hvs_regs is thus a bit too generic, so let's rename it to
something more specific.

Signed-off-by: Maxime Ripard <mripard@kernel.org>
Reviewed-by: Maxime Ripard <mripard@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240621152055.4180873-26-dave.stevenson@raspberrypi.com
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>