Keep replace_instead_of_append in arch prop structs

replace_instead_of_append is read by proptools.ExtendProperties() /
proptools.ExtendMatchingProperties(). These functions are called on
arch property structs, so we need to preserve it when creating the
arch property structs.

Bug: 323382414
Test: m nothing --no-skip-soong-tests
Change-Id: Ic08704d8a2b710f5a5d99b62d3f8a37730bb6013