PCI: rcar: Teardown MSI setup if rcar_pcie_enable() fails

PCI: rcar: Teardown MSI setup if rcar_pcie_enable() fails

If the rcar_pcie_enable() fails and MSIs are enabled, the setup done in
rcar_pcie_enable_msi() is never undone. Add a function to tear down the
MSI setup by disabling the MSI handling in the PCIe block, deallocating
the pages requested for the MSIs and zapping the IRQ mapping.

Reported-by: Geert Uytterhoeven <[email protected]>
Signed-off-by: Marek Vasut <[email protected]>
Signed-off-by: Lorenzo Pieralisi <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]>
Reviewed-by: Simon Horman <[email protected]>
Cc: Geert Uytterhoeven <[email protected]>
Cc: Lorenzo Pieralisi <[email protected]>
Cc: Phil Edworthy <[email protected]>
Cc: Simon Horman <[email protected]>
Cc: Wolfram Sang <[email protected]>
Cc: [email protected]