soc: samsung: gs101-pmu: implement access tables for read and write

soc: samsung: gs101-pmu: implement access tables for read and write

Accessing non-existent PMU registers causes an SError, halting the
system.

Implement read and write access tables for the gs101-PMU to specify
which registers are read- and/or writable to avoid that SError.

Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org>
Signed-off-by: André Draszik <andre.draszik@linaro.org>
Link: https://patch.msgid.link/20251009-gs101-pmu-regmap-tables-v2-3-2d64f5261952@linaro.org
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>