Make aosp_$arch system images closer to GSIs

This change modifies aosp_$arch product makefiles so their
system images can be closer to their respective GSIs.

The added contents in this CL are based on treble_common*.mk.
Contents specific to GSI are in aosp_$arch.mk.
Contents common to all devices are moved to full_base.mk.
Contents related to specific device are moved to device.mk.

BoardConfig related makefiles will be changed in another CL.

Bug: 70772101
Test: The following products can boot to home screen:
    $ lunch aosp_x86-userdebug; m -j; emulator
    $ lunch aosp_x86_64-userdebug; m -j; emulator
    $ lunch aosp_arm-userdebug; m -j; emulator
    $ lunch aosp_arm64-userdebug; m -j; emulator

Change-Id: I225a13dd74b3e748cc5d1705e1a453348b01d43f