iio: adc: break out common code from SPMI VADC

The SPMI VADC and the earlier XOADC share a subset of
common code, so to be able to use the same code in both
drivers, we break out a separate file with the common code,
prefix exported functions that are no longer static with
qcom_* and bake an object qcom-spmi-vadc.o that contains both
files: qcom-vadc-common.o and qcom-spmi-vadc-core.o.

As we need to follow the procedure for making a kernel module
or compiled in object from several files, but still want to
produce the same module name, rename the qcom-spmi-vadc.c
file to qcom-spmi-vadc-core.c so we can bake the two objects
into qcom-spmi-vadc.o

Cc: [email protected]
Cc: [email protected]
Cc: Ivan T. Ivanov <[email protected]>
Cc: Andy Gross <[email protected]>
Cc: Bjorn Andersson <[email protected]>
Cc: Stephen Boyd <[email protected]>
Cc: Srinivas Kandagatla <[email protected]>
Cc: Rama Krishna Phani A <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>
Signed-off-by: Jonathan Cameron <[email protected]>

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