s5l87xx: Use pointer arithmetic in register address calculation
This allows to reuse a register definition across similar SoCs that have the same layout of registers (same offsets), but are using a different base address for the peripheral. The include guard was also fixed to reflect the new file name of the header.
Some registers were renamed in order to match the datasheet and for consistency with the other register numbering.
Change-Id: I0192e227a3c467504b8fcd1eb684a7fc861f7896
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