aarch64: Move ld.so _start to separate file and drop _dl_skip_args

A separate asm file is easier to maintain than a macro that expands to
inline asm.

The RTLD_START macro is only needed now because _dl_start is local in
rtld.c, but _start has to call it, if _dl_start was made hidden then it
could be empty.

_dl_skip_args is no longer needed.

Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>