core: arm32: generate system register access code

Replaces the hand crafted system register code in <arm32.h> and
<arm32_macros.S> with generated code based on arm32_sysreg.txt which is
extracted fr

core: arm32: generate system register access code

Replaces the hand crafted system register code in <arm32.h> and
<arm32_macros.S> with generated code based on arm32_sysreg.txt which is
extracted from the ARM Architecture Reference Manual.

The remaining hand crafted code for cp15 accesses is not covered by the
ARM Architecture Reference Manual.

A script is added to generate both assembly macros and static inline
functions to access the system registers.

Reviewed-by: Jerome Forissier <jerome.forissier@linaro.org>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>

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