Zygote: Add fdsToIgnore

Add file descriptors that should be ignored in the file descriptor
table check.

Use this to ignore the pipe file descriptors when starting an app
with invoke-with (wrapper).

Bug: 32607405
Test: m
Test: Device boots
Test: Apps start
Test: adb root && adb shell setprop wrap.com.android.calculator2 logwrapper && adb shell am start -S -n com.android.calculator2/.Calculator
Change-Id: I4a30dfc9382d3172cc815bd41b17a123799354f6