Create dedicated aconfig folder for catalyst

There will be lots of flags for catalyst, create a dedicated aconfig
folder to maintain the catalyst flags.

Bug: 335132588
Flag: EXEMPT Move aconfig flag
Test: Presubmit
Change-Id: I3806320b16b464e29311d74a3941b40ce5051702

aconfig/Android.bp

@@ -9,6 +9,7 @@ aconfig_declarations {
     container: "system",
     srcs: [
         "*.aconfig",
+        "catalyst/*.aconfig",
     ],
 }
 
@@ -77,4 +78,4 @@ aconfig_declarations {
 java_aconfig_library {
     name: "keyboard_flags_lib",
     aconfig_declarations: "keyboard_flags",
-}
+}