vgsp: add read-only gsp-phys-reg-probe debugfs register snapshot

Add a read-only BAR0 register-liveness probe at
/sys/kernel/debug/vgsp/gsp-phys-reg-probe that prints "name addr value"
for the PMC chip-id/clock gate, PGRAPH status/fault, SKED/HWW and
FECS/GPCCS falcon state, the front-end QMD virtual-window controls and
the GSP context registers, followed by decoded field lines.

Read-only (readl only); additive to gsp_phys_boot_debugfs_init(); no
ladder logic changed. Used to distinguish a clock/power-gated engine
from a halted or running one during a physical cycle.

0 files changed, 0 insertions, 0 deletions