pmdomain: amlogic: Fix mask for the second NNA mem PD domain

pmdomain: amlogic: Fix mask for the second NNA mem PD domain

Without this change, the NPU hangs when the 8th NN core is used.

It matches what the out-of-tree driver does.

Signed-off-by: Tomeu Vizoso <tomeu@tomeuvizoso.net>
Fixes: 9a217b7e8953 ("soc: amlogic: meson-pwrc: Add NNA power domain for A311D")
Acked-by: Neil Armstrong <neil.armstrong@linaro.org>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20231016080205.41982-2-tomeu@tomeuvizoso.net
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>