Fixed the discovery of the dependencies of gem variant aliases which (#2013)

alias INTERFACE LIBRARY targets.

This was causing the dependent Atom_AtomBridge sub gems from not being
found when generating the cmake_dependencies.*.setreg file containing
the list of gem modules to load

Signed-off-by: lumberyard-employee-dm <56135373+lumberyard-employee-dm@users.noreply.github.com>

AutomatedTesting/Gem/Code/enabled_gems.cmake

@@ -47,7 +47,7 @@ set(ENABLED_GEMS
     LmbrCentral
     LyShine
     HttpRequestor
-    Atom_AtomBridge
+    Atom
     AWSCore
     AWSClientAuth
     AWSMetrics

cmake/SettingsRegistry.cmake

@@ -160,12 +160,6 @@ function(ly_delayed_generate_settings_registry)
 
             get_property(has_manually_added_dependencies TARGET ${gem_target} PROPERTY MANUALLY_ADDED_DEPENDENCIES SET)
             get_target_property(target_type ${gem_target} TYPE)
-            if (target_type STREQUAL "INTERFACE_LIBRARY" AND has_manually_added_dependencies)
-                # don't use interface libraries here, we only want ones which produce actual binaries unless the target
-                # is empty. We have still already recursed into their dependencies - they'll show up later.
-                # When the target has no dependencies however we want to add the gem root path to the generated setreg
-                continue()
-            endif()
 
 
             ly_get_gem_module_root(gem_module_root ${gem_target})