Add apexd.mainline_patch_level_2 to PRODUCT_PACKAGES

identifies that the apexd has a fix included for go/mainline-play-installs-incident

Bug: 433787201
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:a89e1ec183c96413380b5e2db37581b7031d04ea)
Merged-In: I7bbd5c9db0144b2ceba0902819e19ce7e56e2985
Change-Id: I7bbd5c9db0144b2ceba0902819e19ce7e56e2985
Merging the fixes for apexd outage to security branches.
Bug: 433787201

Author: Oguzhan Yalcin

target/product/base_system.mk

@@ -28,6 +28,7 @@ PRODUCT_PACKAGES += \
     android.test.mock \
     android.test.runner \
     apexd \
+    apexd.mainline_patch_level_2 \
     appops \
     app_process \
     appwidget \

target/product/generic/Android.bp

@@ -536,6 +536,7 @@ system_image_defaults {
         "android.software.window_magnification.prebuilt.xml", // handheld_system
         "android.system.suspend-service",
         "apexd",
+        "apexd.mainline_patch_level_2",
         "appops",
         "approved-ogki-builds.xml", // base_system
         "appwidget",