PCI: j721e: Use T_PERST_CLK_US macro

PCI: j721e: Use T_PERST_CLK_US macro

[ Upstream commit f96b6971373382855bc964f1c067bd6dc41cf0ab ]

Use the T_PERST_CLK_US macro, and the fsleep() function instead of
usleep_range().

Link: https://lore.kernel.org/linux-pci/20240102-j7200-pcie-s2r-v7-6-a2f9156da6c3@bootlin.com
Signed-off-by: Thomas Richard <thomas.richard@bootlin.com>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Stable-dep-of: 22a9120479a4 ("PCI: j721e: Deassert PERST# after a delay of PCIE_T_PVPERL_MS milliseconds")
Signed-off-by: Sasha Levin <sashal@kernel.org>