ABI: sysfs-platform-sst-atom: use wildcards on What definitions

%x is not a valid wildcard. Use <x> instead, as this allows
script/get_abi.pl to convert it into a regex.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/ca1f384f1e77210e2807f97abe77a36ac5fa284a.1631782432.git.mchehab+huawei@kernel.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/ABI/testing/sysfs-platform-sst-atom

-What:		/sys/devices/platform/8086%x:00/firmware_version
+What:		/sys/devices/platform/8086<x>:00/firmware_version
 Date:		November 2016
 KernelVersion:	4.10
 Contact:	"Sebastien Guiriec" <sebastien.guiriec@intel.com>