MIPS: Malta: Fix crash in SMP kernel on non-CMP systems.

MIPS: Malta: Fix crash in SMP kernel on non-CMP systems.

Since d49978bbefa31ab410c925a32c601a03178f6f24 (lmo) rsp.
8dfa8f674159bfa901fb3b7d48342b9a32df3177 (kernel.org) the Malta code does
no longer probe for presence of GCMP if CMP is not configured.  This means
that the variable gcmp_present well be left at its default value of -1
which normally is meant to indicate that GCMP has not yet been mmapped.
This non-zero value is now interpreted as GCMP being present resulting
in a write attempt to a GCMP register resulting in a crash.

Reported and a build fix on top of my fix by Rob Landley <rob@landley.net>.

Reported-by: Rob Landley <rob@landley.net>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Patchwork: https://patchwork.linux-mips.org/patch/2413/