ANDROID: trusty: Add trusty-log driver

This driver is the consumer side of a ringbuffer of log data
that the secure operating system dumps prints into. Trusty
printfs will be dumped into the kernel log after smc calls
and during panics.

Original commits:
  android-trusty-3.10:
    573f23c5 ("trusty: Add trusty logging driver.")
  android-trusty-4.19:
    27a7e49d ("trusty: Rate limit Trusty logging")
    4009cfcc ("trusty: Add share memory api and call it where needed")
  android-trusty-5.4:
    c154f1cb ("ANDROID: trusty: Modularize trusty-log driver")
    1d7b4458 ("ANDROID: trusty: use SPDX license identifiers")
    a91f687b ("ANDROID: trusty: fix some checkpatch warnings")
    7b9dc353 ("ANDROID: trusty: use flexible arrays instead of zero-length arrays")
    110d7254 ("ANDROID: trusty: remove unneeded assignments to device_driver::owner")
    17e25e8d ("ANDROID: trusty-log: use min_t()")
    bd4fb2f7 ("ANDROID: trusty: make TRUSTY_IRQ and TRUSTY_LOG deselectable")
    0f32db5e ("ANDROID: trusty: remove trivial function entry logging")
    ac7a02ae ("ANDROID: trusty: use dev_*() instead of pr_*()")
    0e580318 ("ANDROID: trusty: avoid using BUG_ON()")
    3f6ac3c6 ("ANDROID: trusty: Kconfig: add help text")
    86a6aff8 ("ANDROID: trusty: use in-kernel integer types")
    bd616a0d ("ANDROID: trusty: fix up headers shared with Trusty")

Bug: 187853933
Change-Id: Ife5449c232ed81438804a2592d1fa6e631bee27c
Signed-off-by: Michael Ryleev <gmar@google.com>
Signed-off-by: Matthew Maurer <mmaurer@google.com>
Signed-off-by: Tri Vo <trong@google.com>
Signed-off-by: Eric Biggers <ebiggers@google.com>