edgetpu: sync critical fixes from darwinn-internal

Roll up the following fixes from darwinn-internal/darwinn-2.0 branch:

4bea3ab59 edgetpu: add support for multiple interfaces
Bug: 191193044
a3845eb1f edgetpu: restrict debugfs statusregs file to non-mobile chipsets
0cf49546e edgetpu: add "is a mobile style device" feature flag
Bug: 194228073
0afc743e5 edgetpu: abrolhos: expose thermal suspend/resume
[toddpoynor@google.com: fixup merge conflict on pwr_state enum]
Bug: 193247519
34bd4e2d2 edgetpu: abrolhos: Send throttling notification KCI only if TPU is on.
Bug: 193254607

Signed-off-by: Erick Reyes <erickreyes@google.com>
Signed-off-by: abhilashkul <abhilashkul@google.com>
Signed-off-by: David Chiang <davidchiang@google.com>
Signed-off-by: Todd Poynor <toddpoynor@google.com>
Change-Id: I5eb392271b07f28bba66701639e453f2674cfad2