BpfSyscallWrappers: remove mapRetrieve() am: dfef229781 am: a955642799

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/3113719

Change-Id: Ib7efb1b85a550bece1ee492e74fec9242a1dd7ee
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>