libbinder_ndk: AParcel_fromJavaParcel

This allows creating a view into a Java Parcel. Note, that this doesn't
allow conversions of both directions. This is mostly out of convenience:
Parcel.obtain(long) only allows us to create a view. Also, there isn't
currently a usecase for this other API.

Bug: 145227478
Test: atest CtsNdkBinderTestCases
Change-Id: Iec043741ec778036e167aaf9a2fb275d4309e8f6