libatomics-ops: update to the latest version 7.2

libatomics-ops: update to the latest version 7.2

All old patches are droped because:

Merged into 7.2 by upstream:
* fedora/libatomic_ops-1.2-ppclwzfix.patch
* gentoo/libatomic_ops-1.2-mips.patch
* gentoo/sh4-atomic-ops.patch
* libatomics-ops_fix_for_x32.patch

Obsolete:
* doublefix.patch

(From OE-Core rev: cf7a52c8f2b84901421c7e2cee3009fe91687a1c)

Signed-off-by: Xin Ouyang <Xin.Ouyang@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>