atv sdk: get emulator TV image to boot

The original init.ranchu.rc file does not
setprop vold.post_fs_data_done 1
and consequently, the data partition cannot
be mounted correctly.

BUG: 64401460

Test: build sdk_google_atv_x86-sdk
and boot it to home

Change-Id: I00046e57c3c568c4ab9ff2393cb989d0f42c0aa7
Merged-In: I00046e57c3c568c4ab9ff2393cb989d0f42c0aa7