PCI: rockchip: Simplify reset control handling by using reset_control_bulk*() function

Currently, the driver acquires and asserts/deasserts the resets
individually thereby making the driver complex to read.

This can be simplified by using the reset_control_bulk() APIs.

Use devm_reset_control_bulk_get_exclusive() API to acquire all the resets
and use reset_control_bulk_{assert/deassert}() APIs to assert/deassert them
in bulk.

Following the recommendations in 'Rockchip RK3399 TRM v1.3 Part2':

  1. Split the reset controls into two groups as per section '17.5.8.1.1
     PCIe as Root Complex'.

  2. Deassert the 'Pipe, MGMT Sticky, MGMT, Core' resets in groups as per
     section '17.5.8.1.1 PCIe as Root Complex'. This is accomplished using
     the reset_control_bulk APIs.

Link: https://lore.kernel.org/r/[email protected]
Co-developed-by: Dan Carpenter <[email protected]>
Signed-off-by: Anand Moon <[email protected]>
Signed-off-by: Lorenzo Pieralisi <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
[kwilczynski: squash error handling fix from https://lore.kernel.org/r/[email protected]]
Signed-off-by: Krzysztof Wilczyński <[email protected]>
Reviewed-by: Manivannan Sadhasivam <[email protected]>

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