Send the shared memory window last

This ensures that all of the interrupts are initialized before
Android begins to boot. ivshmem_common_realize calls ivshmem_recv_setup,
which exits only when it gets the shared memory window.

BUG: 111000656
Test: Boot completes, as does the e2e test
Test: Debian 1:2.12~rc3+dfsg-1
Test: Debian 1:2.11+dfsg-1
Test: vsoc-0.7pre4 image (1:2.8+dfsg-6+deb9u4)

Change-Id: I55d75e0b542aa96dcf7abc4a38226bc6305ac7fa