vndk-sp: Remove android.hidl.memory@1.0-impl

This commit removes android.hidl.memory@1.0-impl.so from
/system/lib[64]/vndk-sp becuase android.hidl.memory@1.0.so is using
absolute path and will only search for /system/lib[64]/hw or
/vendor/lib[64]/hw.

Bug: 35107583
Bug: 62778280
Test: sailfish boots
Test: Write a small SP-HAL which links to libhidlmemory, load the
testing SP-HAL lib from system executable, and it works when
ld.config.txt exposes android.hidl.memory@1.0-impl.so from default
linker namespace.

Change-Id: I87238337cb70ff9b27ef1b25dc5fb982a84ff0b3