Adding a system property to enable 16k dev options

16K dev option should be visible on particular devices which set
PRODUCT_16K_DEVELOPER_OPTION. Adding a system property which will be
enabled based on this option.

Test: m, booted device with PRODUCT_16K_DEVELOPER_OPTION ON/OFF and
verified option visibility.
Bug: 297922563

Change-Id: I6d1cd2ce0c6f38fb43222d8e1ac2b797ef675c62