arm64: fix missing asm/io.h include in kernel/smp_spin_table.c
arm64: fix missing asm/io.h include in kernel/smp_spin_table.c

On next-20150105, defconfig compilation breaks with:

arch/arm64/kernel/smp_spin_table.c:80:2: error: implicit declaration of function ‘ioremap_cache’ [-Werror=implicit-function-declaration]
arch/arm64/kernel/smp_spin_table.c:92:2: error: implicit declaration of function ‘writeq_relaxed’ [-Werror=implicit-function-declaration]
arch/arm64/kernel/smp_spin_table.c:101:2: error: implicit declaration of function ‘iounmap’ [-Werror=implicit-function-declaration]

Fix by including asm/io.h, which contains definitions or prototypes
for these macros or functions.

This second version incorporates a comment from Mark Rutland
<1db9dd262beaa64f35756dd39531d9747b7778bb@arm.com> to keep the includes in alphabetical order
by filename.

Signed-off-by: Paul Walmsley <a027184a55211cd23e3f3094f1fdc728df5e0500@pwsan.com>
Cc: Paul Walmsley <c1d7852bb5ee1be014bfca67505154cd83036c8a@nvidia.com>
Cc: Catalin Marinas <15ce75b290ebaf27c3f9fd73ab848685ed3d8261@arm.com>
Cc: Will Deacon <b913f13ef92ac157955c954ccaaff7be065faba4@arm.com>
Acked-by: Mark Rutland <1db9dd262beaa64f35756dd39531d9747b7778bb@arm.com>
Signed-off-by: Will Deacon <b913f13ef92ac157955c954ccaaff7be065faba4@arm.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs