mfd: syscon: Return -ENOSYS if CONFIG_MFD_SYSCON is not enabled
Some platforms may not define CONFIG_MFD_SYSCON (or haven't syscon), it can fix build error for these platforms. Signed-off-by: NPeter Chen <peter.chen@freescale.com> Signed-off-by: NLee Jones <lee.jones@linaro.org>
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