Add MAX77693 prefix to some of the defines used in max77693 extcon
driver so the max77693-private.h can be included simultaneously with
max77843-private.h.

Additionally use BIT() macro in header.
Signed-off-by: NKrzysztof Kozlowski <k.kozlowski.k@gmail.com>
Acked-by: NLee Jones <lee.jones@linaro.org>
Acked-by: NChanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: NMark Brown <broonie@kernel.org>