[PATCH v2] tpm: use struct tpm_chip for tpm_chip_find_get()

On Wed, Oct 25, 2017 at 01:55:04PM +0200, Jarkko Sakkinen wrote:

Device number (the character device index) is not a stable identifier
for a TPM chip. That is the reason why every call site passes
TPM_ANY_NUM to tpm_chip_find_get().

This commit changes the API in a way that instead a struct tpm_chip
instance is given and NULL means the default chip. In addition, this
commit refines the documentation to be up to date with the
implementation.

Suggested-by: Jason Gunthorpe <redacted> (@chip_num -> @chip)
Signed-off-by: Jarkko Sakkinen <redacted>
v2:
* Further defined function documentation.
* Changed @chip_num to @chip instead of removing the parameter as suggested by
  Jason Gunthorpe.

Reviewed-by: Jason Gunthorpe <redacted>

Jason
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