The OVMF target binaries are (currently) x86-specific, but the native
tools to build them are not.
Make the COMPATIBLE_HOST assignment target-specific, so that the native
tools can be built on an arm64 build server.
(From OE-Core rev: 58ebb47688fc98fdaeb78b4033bd31100218d5d6)
Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>