hw/arm_sysctl: Handle SYS_CFGCTRL in a more structured way

The SYS_CFGCTRL register consists of separate fields
for DCC, function, site, position and device, as well
as a read/write bit. Refactor the code handling SYS_CFGCTRL
writes to make it easier to add support for functions
like SYS_CFG_OSC which support multiple device fields.
We also pull the handling out into its own function for
clarity, as there are potentially a lot of implementable
subfunctions.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

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