components: multiple components for a device

Component framework is extended to support multiple components for
a struct device. These will be matched with different masters based on
its sub component value.

We are introducing this, as I915 needs two different components
with different subcomponent value, which will be matched to two
different component masters(Audio and HDCP) based on the subcomponent
values.

v2: Add documenation.

v3: Rebase on top of updated documenation.

v4: Review from Rafael:
- Remove redundant "This" from kerneldoc (also in the previous patch)
- Streamline the logic in find_component() a bit.

Signed-off-by: Daniel Vetter <[email protected]> (v1 code)
Signed-off-by: Ramalingam C <[email protected]> (v1 commit message)
Cc: Ramalingam C <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Russell King <[email protected]>
Cc: Rafael J. Wysocki <[email protected]>
Cc: Jaroslav Kysela <[email protected]>
Cc: Takashi Iwai <[email protected]>
Cc: Rodrigo Vivi <[email protected]>
Cc: Jani Nikula <[email protected]>
Reviewed-by: Greg Kroah-Hartman <[email protected]>
Reviewed-by: Rafael J. Wysocki <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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