Remove "_host" and "_static" suffix from libsparse definition.

This now combines all the "libsparse" libraries into the same soong
target. A minor side-effect of this change is that the libsparse
static library depends on the libz shared library instead of the libz
static library. This minor change has no effect since targets using
the static libsparse library need to explicitly include either the
static libz or the shared one.

Bug: 34220783
Change-Id: I8f41586cf4c3336791cfa57ab4f5ae59a76d7ffa