platform: Provide stubs for !HAS_IOMEM builds

The various _ioremap_resource functions are not built when
CONFIG_HAS_IOMEM is disabled but no stubs are provided. Given how
widespread IOMEM usage is in drivers and how rare !IOMEM configurations
are in practical use let's just provide some stubs so users will build
without having to add explicit dependencies on IOMEM.

The most likely use case is builds with UML for KUnit testing.

Reviewed-by: Greg Kroah-Hartman <[email protected]>
Reviewed-by: David Gow <[email protected]>
Reviewed-by: Takashi Iwai <[email protected]>
Signed-off-by: Mark Brown <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

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