usb: reduce kernel log spam on driver registration

Drivers are typically supposed to be quiet unless they are actually
probed, but for some reason, USB host controllers seem to be exempt from
this rule, and happily broadcast their existence into the kernel log at
boot even if the hardware in question is nowhere to be found.

Let's fix that, and remove these pr_info() calls.

Cc: Alan Stern <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Nicolas Ferre <[email protected]>
Cc: Alexandre Belloni <[email protected]>
Cc: Claudiu Beznea <[email protected]>
Cc: Krzysztof Kozlowski <[email protected]>
Cc: Alim Akhtar <[email protected]>
Cc: Avi Fishman <[email protected]>
Cc: Tomer Maimon <[email protected]>
Cc: Tali Perry <[email protected]>
Cc: Patrick Venture <[email protected]>
Cc: Nancy Yuen <[email protected]>
Cc: Benjamin Fair <[email protected]>
Cc: Patrice Chotard <[email protected]>
Cc: Vladimir Zapolskiy <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
Reviewed-by: Alim Akhtar <[email protected]>
Acked-by: Alan Stern <[email protected]>
Signed-off-by: Ard Biesheuvel <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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