Remove .(ll)ndk suffix from (ll)ndk_library

Soong handles these automatically now.

Bug: 33241851
Test: Android-aosp_arm.mk is the same before/after
Test: build.ninja is the same before/after
Test: build-aosp_arm.ninja is the same before/after
Change-Id: I5a16edfb57ca9d3059cdef0a57c7c79e614878fe