Revert "Load the gralloc module at library load"

This reverts commit 33c08a53. Some
gralloc implementations apparently have library initializers (executed
on dlopen) which create anonymous sockets, open device nodes, etc.
which Zygote and some other non-Zygote-child processes that use libui
don't have permissions to do. When the library initializer fails, it
crashes the process.

Reverting this until this initialization code can be made lazy (on
first use of gralloc).

Bug: 62732270
Test: boot fugu to launcher