Install product shared libraries in /product/lib

This is to support /product/lib. Shared libraries with
LOCAL_PRODUCT_MODULE := true or product_specific: true has been
installed in /system/lib. They are now installed in /product/lib.

Bug: 73095206
Test: build succeeded && product libraries are installed under
/product/lib

Change-Id: Ic49a0a3e1e47666c4d15189ab6fded8007ecb498