ABI: sysfs-bus-soundwire-master: use wildcards on What definitions

An "N" upper letter is not a wildcard, nor can easily be identified
by script, specially since the USB sysfs define things like.
bNumInterfaces. Use, instead, <N>, in order to let 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/eb62c19ce92c0dc1a50eb57c1052866256250644.1631782432.git.mchehab+huawei@kernel.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/ABI/testing/sysfs-bus-soundwire-master

-What:		/sys/bus/soundwire/devices/sdw-master-N/revision
-		/sys/bus/soundwire/devices/sdw-master-N/clk_stop_modes
-		/sys/bus/soundwire/devices/sdw-master-N/clk_freq
-		/sys/bus/soundwire/devices/sdw-master-N/clk_gears
-		/sys/bus/soundwire/devices/sdw-master-N/default_col
-		/sys/bus/soundwire/devices/sdw-master-N/default_frame_rate
-		/sys/bus/soundwire/devices/sdw-master-N/default_row
-		/sys/bus/soundwire/devices/sdw-master-N/dynamic_shape
-		/sys/bus/soundwire/devices/sdw-master-N/err_threshold
-		/sys/bus/soundwire/devices/sdw-master-N/max_clk_freq
+What:		/sys/bus/soundwire/devices/sdw-master-<N>/revision
+		/sys/bus/soundwire/devices/sdw-master-<N>/clk_stop_modes
+		/sys/bus/soundwire/devices/sdw-master-<N>/clk_freq
+		/sys/bus/soundwire/devices/sdw-master-<N>/clk_gears
+		/sys/bus/soundwire/devices/sdw-master-<N>/default_col
+		/sys/bus/soundwire/devices/sdw-master-<N>/default_frame_rate
+		/sys/bus/soundwire/devices/sdw-master-<N>/default_row
+		/sys/bus/soundwire/devices/sdw-master-<N>/dynamic_shape
+		/sys/bus/soundwire/devices/sdw-master-<N>/err_threshold
+		/sys/bus/soundwire/devices/sdw-master-<N>/max_clk_freq
 
 Date:		April 2020