arm: histb: Remove <common.h> and add needed includes

Remove <common.h> from all mach-histb files and when needed add missing
include files directly.

Signed-off-by: Tom Rini <trini@konsulko.com>
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Cc: Peter Griffin <peter.griffin@linaro.org>
Cc: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>