drm/etnaviv: add sensitive state for PE_RT_ADDR_4_PIPE(3, 0|1) address
0x1540 is the address of 4th render target address pair (two pixel pipes).
Signed-off-by: Christian Gmeiner <cgmeiner@igalia.com>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
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