Rollback "Make com.android.sepolicy mandatory"

Rolling back the changes from aosp/2199179.

Bug: 243923977#comment9
Test: adb shell ls /dev/selinux /system/etc/selinux
Change-Id: If205f106230c2f076f72396011b68079ddd4d253

target/product/base_system.mk

@@ -69,7 +69,6 @@ PRODUCT_PACKAGES += \
     com.android.neuralnetworks \
     com.android.scheduling \
     com.android.sdkext \
-    com.android.sepolicy \
     com.android.tethering \
     com.android.tzdata \
     com.android.uwb \
@@ -376,7 +375,6 @@ PRODUCT_SYSTEM_PROPERTIES += persist.traced.enable=1
 PRODUCT_PACKAGES_DEBUG := \
     adb_keys \
     arping \
-    com.android.sepolicy.cert-debug.der \
     dmuserd \
     idlcli \
     init-debug.rc \