MIPS: Remove "weak" from mips_cdmm_phys_base() declaration

MIPS: Remove "weak" from mips_cdmm_phys_base() declaration

Weak header file declarations are error-prone because they make every
definition weak, and the linker chooses one based on link order (see
abef42debb2e ("PCI: Remove __weak annotation from pcibios_get_phb_of_node
decl")).

mips_cdmm_phys_base() is defined only in arch/mips/mti-malta/malta-memory.c
so there's no problem with multiple definitions.  But it works better to
have a weak default implementation and allow a strong function to override
it.  Then we don't have to test whether a definition is present, and if
there are ever multiple strong definitions, we get a link error instead of
calling a random definition.

Add a weak mips_cdmm_phys_base() definition and remove the weak annotation
from the declaration in arch/mips/include/asm/cdmm.h.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: James Hogan <james.hogan@imgtec.com>
Cc: Andrew Bresticker <abrestic@chromium.org>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/10688/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>