vndk-sp: Copy libhidlmemory.so to vndk-sp

This commit copies libhidlmemory.so and its dependencies to vndk-sp
directory because some vendors' GLES implementation relies on
libhidlmemory.so.  Check http://b/35107583#comment15 for the context.

Bug: 35107583
Test: libhidlmemory, android.hidl.memory@1.0, and
android.hidl.memory@1.0-impl are installed into /system/lib[64]/vndk-sp
Test: sailfish boots

Merged-In: I20b6bce4e55b031645f3a0f4fd2c72fdcc573248
Change-Id: I95035a2a73c8ca504f9ae77842b2d5c3018dfa3c