Commit 5857730c

 ("builtin-run: Pass console= parameter based on
active console") adds a console parameter to the kernel command line,
but doesn't account for x86 kvm__arch_set_cmdline populating
real_cmdline without adding a space. Fix the concatenation.

Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>