Add additional dl_phdr_info fields

Previously, Bionic's dl_phdr_info only included the first four
dl_iterate_phdr fields. Several other libc's have these additional fields:

    unsigned long long dlpi_adds -- incremented when a library is loaded
    unsigned long long dlpi_subs -- incremented when a library is unloaded
    size_t dlpi_tls_modid -- TLS module ID
    void* dlpi_tls_data -- pointer to current thread's TLS block or NULL

These extra fields are also exposed by glibc, musl, and FreeBSD. The
unwinder in libgcc.a, linked into shipping Android DSOs, has a
PC->eh_frame cache that activates if dl_phdr_info has the dlpi_adds and
dlpi_subs fields (indicated at run-time by a sufficiently-large size
argument to the callback).

Bug: https://github.com/android-ndk/ndk/issues/1062
Test: bionic unit tests
Change-Id: I6f0bab548cf8c828af2ddab9eb01c5c6d70cd81f

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