m68k: mvme147: Reinstate early console

[ Upstream commit 077b33b9e2833ff25050d986178a2c4c4036cbac ]

Commit a38eaa07 ("m68k/mvme147: config.c - Remove unused
functions"), removed the console functionality for the mvme147 instead
of wiring it up to an early console.  Put the console write function
back and wire it up like mvme16x does so it's possible to see Linux boot
on this fine hardware once more.

Fixes: a38eaa07 ("m68k/mvme147: config.c - Remove unused functions")
Signed-off-by: Daniel Palmer <daniel@0x0f.com>
Co-developed-by: Finn Thain <fthain@linux-m68k.org>
Signed-off-by: Finn Thain <fthain@linux-m68k.org>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Link: https://lore.kernel.org/a82e8f0068a8722996a0ccfe666abb5e0a5c120d.1730850684.git.fthain@linux-m68k.org


Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>