PCI: remove ARCH_SUPPORTS_MSI kconfig option

PCI: remove ARCH_SUPPORTS_MSI kconfig option

Now that we have weak versions for each of the PCI MSI architecture
functions, we can actually build the MSI support for all platforms,
regardless of whether they provide or not architecture-specific
versions of those functions. For this reason, the ARCH_SUPPORTS_MSI
hidden kconfig boolean becomes useless, and this patch gets rid of it.

Signed-off-by: Thomas Petazzoni <[email protected]>
Acked-by: Bjorn Helgaas <[email protected]>
Acked-by: Benjamin Herrenschmidt <[email protected]>
Tested-by: Daniel Price <[email protected]>
Tested-by: Thierry Reding <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: [email protected]
Cc: Martin Schwidefsky <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: Thomas Gleixner <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Cc: [email protected]
Cc: Russell King <[email protected]>
Cc: Tony Luck <[email protected]>
Cc: Fenghua Yu <[email protected]>
Cc: [email protected]
Cc: Ralf Baechle <[email protected]>
Cc: [email protected]
Cc: David S. Miller <[email protected]>
Cc: [email protected]
Cc: Chris Metcalf <[email protected]>
Signed-off-by: Jason Cooper <[email protected]>