Without this change the exynos adc controller needed to have its phy
enabled in some out-of-driver C code.  Add support for specifying the
phy enable register by listing it in the reg list.
Signed-off-by: NDoug Anderson <dianders@chromium.org>
Tested-by: NNaveen Krishna Chatradhi <ch.naveen@samsung.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>