gxp: Add a static debug pointer to driver state To assist with debugging of ramdumps where the GXP driver is not in the backstack, add a static symbol containing a pointer to the driver state so it can be located quickly in memory. Bug: 255451381 Signed-off-by: John Scheible <[email protected]> Change-Id: Ie68196f2642e839932dee0c3a972f17f563e2764