sparc/PCI: Reserve legacy mmio after PCI mmio

sparc/PCI: Reserve legacy mmio after PCI mmio

On one system found bunch of claim resource fail from pci device.
pci_sun4v f02b894c: PCI host bridge to bus 0000:00
pci_bus 0000:00: root bus resource [io  0x2007e00000000-0x2007e0fffffff] (bus address [0x0000-0xfffffff])
pci_bus 0000:00: root bus resource [mem 0x2000000000000-0x200007effffff] (bus address [0x00000000-0x7effffff])
pci_bus 0000:00: root bus resource [mem 0x2000100000000-0x20007ffffffff] (bus address [0x100000000-0x7ffffffff])
...
PCI: Claiming 0000:00:02.0: Resource 14: 0002000000000000..00020000004fffff [200]
pci 0000:00:02.0: can't claim BAR 14 [mem 0x2000000000000-0x20000004fffff]: address conflict with Video RAM area [??? 0x20000000a0000-0x20000000bffff flags 0x80000000]
pci 0000:02:00.0: can't claim BAR 0 [mem 0x2000000000000-0x20000000fffff]: no compatible bridge window
PCI: Claiming 0000:02:00.0: Resource 3: 0002000000100000..0002000000103fff [200]
pci 0000:02:00.0: can't claim BAR 3 [mem 0x2000000100000-0x2000000103fff]: no compatible bridge window
PCI: Claiming 0000:02:00.1: Resource 0: 0002000000200000..00020000002fffff [200]
pci 0000:02:00.1: can't claim BAR 0 [mem 0x2000000200000-0x20000002fffff]: no compatible bridge window
PCI: Claiming 0000:02:00.1: Resource 3: 0002000000104000..0002000000107fff [200]
pci 0000:02:00.1: can't claim BAR 3 [mem 0x2000000104000-0x2000000107fff]: no compatible bridge window
PCI: Claiming 0000:02:00.2: Resource 0: 0002000000300000..00020000003fffff [200]
pci 0000:02:00.2: can't claim BAR 0 [mem 0x2000000300000-0x20000003fffff]: no compatible bridge window
PCI: Claiming 0000:02:00.2: Resource 3: 0002000000108000..000200000010bfff [200]
pci 0000:02:00.2: can't claim BAR 3 [mem 0x2000000108000-0x200000010bfff]: no compatible bridge window
PCI: Claiming 0000:02:00.3: Resource 0: 0002000000400000..00020000004fffff [200]
pci 0000:02:00.3: can't claim BAR 0 [mem 0x2000000400000-0x20000004fffff]: no compatible bridge window
PCI: Claiming 0000:02:00.3: Resource 3: 000200000010c000..000200000010ffff [200]
pci 0000:02:00.3: can't claim BAR 3 [mem 0x200000010c000-0x200000010ffff]: no compatible bridge window

The bridge 00:02.0 resource does not get reserved as Video RAM take the position early,
and following children resources reservation all fail.

Move down Video RAM area reservation after pci mmio get reserved,
so we leave pci driver to use those regions.

-v5: merge simplify one and use pcibios_bus_to_resource()

-v6: use pci_find_bus_resource()

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Tested-by: Khalid Aziz <khalid.aziz@oracle.com>
Cc: sparclinux@vger.kernel.org
Orabug: 22855133

Signed-off-by: Khalid Aziz <khalid.aziz@oracle.com>
(cherry picked from commit bb2c8f32be84cbeec0dd585481c637657e73b05e)
Signed-off-by: Allen Pais <allen.pais@oracle.com>