ANDROID: add MODULE_SIG_PROTECT and MODULE_SIG_PROTECT_LIST options

MODULE_SIG_PROTECT_LIST - list of modules whose exports to protect

MODULE_SIG_PROTECT - readonly, set automatically based on the value of
MODULE_SIG_PROTECT_LIST; used for determining whether symbol exportion
is enabled in scripts, Makefiles and preprocessor directives

Bug: 393366754
Change-Id: I70bb82c24dcd18de5bb3db4924acca5799539fc9
Signed-off-by: Sid Nayyar <sidnayyar@google.com>