Mark packages/providers/MediaProvider apps in updatable apexes with updatable: true

Set updatable: true for apps that are embedded in updatable apexes.
This replaces the top down propagation that was automatically setting
the flag in order to unblock support for incremental Soong analysis.

Bug: 367784740
Test: builds
Flag: EXEMPT refactor
Change-Id: I2e197377090e3230421e079af6e31375ed33cfe6