of/address: Rework bus matching to avoid warnings

With warnings added for deprecated #address-cells/#size-cells handling,
the DT address handling code causes warnings when used on nodes with no
address. This happens frequently with calls to of_platform_populate() as
it is perfectly acceptable to have devices without a 'reg' property. The
desired behavior is to just silently return an error when retrieving an
address.

The warnings can be avoided by checking for "#address-cells" presence
first and checking for an address property before fetching
"#address-cells" and "#size-cells".

Reported-by: Marek Szyprowski <[email protected]>
Reported-by: Steven Price <[email protected]>
Tested-by: Marek Szyprowski <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Rob Herring (Arm) <[email protected]>

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