hw/i8042: Compile only for x86

The initialization function for the i8042 emulated device does exactly
nothing for all architectures, except for x86. As a result, the device
is usable only for x86, so let's make the file an architecture specific
object file.

Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
2 files changed