ANDROID: GKI: Disable security lockdown for unsigned modules

By default with SELinux enabled behavior for unsigned
module loading is same as sig_enforce=1. This causes
loading of unsigned modules fail. All modules in Android
GKI are unsigned except GKI modules. Do not prevent
module loading in case of CONFIG_SIG_MODULE_PROTECT; which
was introduced to change behavior of sig_enforce to allow
unsigned modules but not access to protected symbols.

Bug: 200082547
Bug: 214445388
Fixes: 9ab6a242 ("ANDROID: GKI: Add module load time protected symbol lookup")
Test: TreeHugger
Signed-off-by: Ramji Jiyani <ramjiyani@google.com>
Change-Id: Iab3113d706cbd7db7a5684897bcafd5671a6d424