Merge remote-tracking branch 'remotes/xtensa/tags/20210521-xtensa' into staging

Merge remote-tracking branch 'remotes/xtensa/tags/20210521-xtensa' into staging

target/xtensa updates for v6.1:

- don't generate extra EXCP_DEBUG on exception
- fix l32ex access ring
- clean up unaligned access

# gpg: Signature made Fri 21 May 2021 14:59:30 BST
# gpg:                using RSA key 2B67854B98E5327DCDEB17D851F9CC91F83FA044
# gpg:                issuer "jcmvbkbc@gmail.com"
# gpg: Good signature from "Max Filippov <filippov@cadence.com>" [unknown]
# gpg:                 aka "Max Filippov <max.filippov@cogentembedded.com>" [full]
# gpg:                 aka "Max Filippov <jcmvbkbc@gmail.com>" [full]
# Primary key fingerprint: 2B67 854B 98E5 327D CDEB  17D8 51F9 CC91 F83F A044

* remotes/xtensa/tags/20210521-xtensa:
  target/xtensa: clean up unaligned access
  target/xtensa: fix access ring in l32ex
  target/xtensa: don't generate extra EXCP_DEBUG on exception

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>