Merge remote-tracking branch 'remotes/rth/tags/pull-tcg-20191111' into staging

Remove no-longer-true statement that TCG is BSD-licensed

# gpg: Signature made Mon 11 Nov 2019 15:24:06 GMT
# gpg:                using RSA key 7A481E78868B4DB6A85A05C064DF38E8AF7E215F
# gpg:                issuer "richard.henderson@linaro.org"
# gpg: Good signature from "Richard Henderson <richard.henderson@linaro.org>" [full]
# Primary key fingerprint: 7A48 1E78 868B 4DB6 A85A  05C0 64DF 38E8 AF7E 215F

* remotes/rth/tags/pull-tcg-20191111:
  tcg/LICENSE: Remove out of date claim about TCG subdirectory licensing
  tcg/ppc/tcg-target.opc.h: Add copyright/license
  tcg/i386/tcg-target.opc.h: Add copyright/license
  tcg/aarch64/tcg-target.opc.h: Add copyright/license

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