x86: fix a couple of sparse warnings

[Dmitri Vorobiev]

Hi Ingo, Peter, Thomas,

Here is a couple of patches that fix sparse warnings
produced while compiling defconfig for i386:

<<<<<

arch/x86/kernel/reboot.c:32:5: warning: symbol 'reboot_force' was not declared. Should it be static?

arch/x86/kernel/pci-dma.c:17:5: warning: symbol 'iommu_sac_force' was not declared. Should it be static?

<<<<<

These patches were compile-tested using defconfig for both
i386 and x86_64. Also, a runtime test was successfully
performed by booting i386 and x86_64 boxes up to the shell
prompt.

Patches apply cleanly to current x86.git.

Please consider.

Thanks,
Dmitri Vorobiev
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