coresight: tpdm: Constify amba_id table

'struct amba_id' table is not modified so can be changed to const for
more safety.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20250222-coresight-const-arm-id-v1-3-69a377cd098b@linaro.org