project: vm-x86_64-security*.mk: add makefiles for the security VM

create 4 variants for the security VM:
- vm-x86_64-security-user
- vm-x86_64-security-userdebug
- vm-x86_64-security-placeholder-trusted-hal-user
- vm-x86_64-security-placeholder-trusted-hal-userdebug

Bug: 394704863
Test: build any of the security VM targets
Change-Id: I56547d2b64efc8314fc528c2fa306fdc2bdaf3ac