sh64: Fix up section mismatch warnings.

WARNING: vmlinux.o(.cpuinit.text+0x280): Section mismatch in reference from the function cpu_probe() to the function .init.text:sh64_tlb_init()
The function __cpuinit cpu_probe() references
a function __init sh64_tlb_init().
If sh64_tlb_init is only used by cpu_probe then
annotate sh64_tlb_init with a matching annotation.

sh64_tlb_init() simply needs to be __cpuinit annotated, so fix that up.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>