The static device dependencies from devicetree are not the only ones
that might be present at runtime. Add API that allows visiting
required devices without assuming that handles for or pointers to them
can be accessed as a static contiguous sequence.
Signed-off-by: Peter Bigot <peter.bigot@nordicsemi.no>
A number of HALs define GPIO so we get a conflict in error of the form:
main.c:12: error: "GPIO" redefined [-Werror]
Fix this by rename the defines in the test to "TEST_". So GPIO becomes
TEST_GPIO.
Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
