drm/amd/display: Don't use fsleep for PSR exit waits

stable inclusion
from stable-v6.6.1
commit 2a79e92f23bce01a197486738ac11e3d1c04ef58
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8IKRU

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=2a79e92f23bce01a197486738ac11e3d1c04ef58



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[ Upstream commit 79df45dc4bfb13d9bd3a75338b9d9dab948be3d6 ]

[Why]
These functions can be called from high IRQ levels and the OS will hang
if it tries to use a usleep_highres or a msleep.

[How]
Replace the fsleep with a udelay.

Reviewed-by: Aric Cyr <aric.cyr@amd.com>
Acked-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>