SF: Fix HWComposer destruction order

The DisplayData vector was being destroyed before the HWC2::Device, but
HWC2::Layer destruction calls back into HWComposer::destroyLayer, which
looks up DisplayData for the display being destroyed.

Bug: 74619554
Test: dvr_display-test
Change-Id: I6260ae16b0896f8992db8ebde63ad4bfc0a0d532