Add flag for controling app image generation

So that package manager service can control this.

Bug: 72696798
Test: manual
Change-Id: I15fa74aff24ef14d22541117408840f80b7d300f
diff --git a/cmds/installd/otapreopt.cpp b/cmds/installd/otapreopt.cpp
index 58355f9..96d8c47 100644
--- a/cmds/installd/otapreopt.cpp
+++ b/cmds/installd/otapreopt.cpp
@@ -82,8 +82,9 @@
 static_assert(DEXOPT_ENABLE_HIDDEN_API_CHECKS == 1 << 10,
         "DEXOPT_ENABLE_HIDDEN_API_CHECKS unexpected");
 static_assert(DEXOPT_GENERATE_COMPACT_DEX == 1 << 11, "DEXOPT_GENERATE_COMPACT_DEX unexpected");
+static_assert(DEXOPT_GENERATE_APP_IMAGE == 1 << 12, "DEXOPT_GENERATE_APP_IMAGE unexpected");
 
-static_assert(DEXOPT_MASK           == (0xdfe | DEXOPT_IDLE_BACKGROUND_JOB),
+static_assert(DEXOPT_MASK           == (0x1dfe | DEXOPT_IDLE_BACKGROUND_JOB),
               "DEXOPT_MASK unexpected.");