ASoC: codecs: wcd939x-sdw: Correct Soundwire ports mask

ASoC: codecs: wcd939x-sdw: Correct Soundwire ports mask

Device has up to WCD939X_MAX_TX_SWR_PORTS (or WCD939X_MAX_RX_SWR_PORTS
for sink) number of ports and the array assigned to prop.src_dpn_prop
and prop.sink_dpn_prop has 0..WCD939X_MAX_TX_SWR_PORTS-1 elements.  On
the other hand, GENMASK(high, low) creates an inclusive mask between
<high, low>, so we need the mask from 0 up to WCD939X_MAX_TX_SWR_PORTS-1.

Theoretically, too wide mask could cause an out of bounds read in
sdw_get_slave_dpn_prop() in stream.c, however only in the case of buggy
driver, e.g. adding incorrect number of ports via
sdw_stream_add_slave().

Fixes: be2af391cea0 ("ASoC: codecs: Add WCD939x Soundwire devices driver")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://patch.msgid.link/20240726-asoc-wcd-wsa-swr-ports-genmask-v1-3-d4d7a8b56f05@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>