pwm: meson: Simplify duplicated per-channel tracking

stable inclusion
from stable-v5.10.190
commit b306d09967caa0f2ec1f63280b175b7be49260f3
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I928UI

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=b306d09967caa0f2ec1f63280b175b7be49260f3



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[ Upstream commit 5f97f18f ]

The driver tracks per-channel data via struct pwm_device::chip_data and
struct meson_pwm::channels[]. The latter holds the actual data, the former
is only a pointer to the latter. So simplify by using struct
meson_pwm::channels[] consistently.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Stable-dep-of: 87a2cbf0 ("pwm: meson: fix handling of period/duty if greater than UINT_MAX")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: sanglipeng <sanglipeng1@jd.com>