cmd: Read All PCRs if user doesn't specify hash algorithm
cmd: Read All PCRs if user doesn't specify hash algorithm

This is a *breaking change*, but not a huge one. The format is also now
more consistent with the output of "tpm2 readpcr".

Signed-off-by: Joe Richey <24d3dd8348b5cac19a417e52b4f8141ba91506f0@google.com>

google/go-tpm-tools,google/go-tpm-tools,google/go-tpm-tools