nvmem: use EOPNOTSUPP instead of ENOSYS
Checkpatch emits warnings when using ENOSYS. Some of the frameworks started using EOPNOTSUPP as return values for API functions when given subsystem is disabled in Kconfig. Signed-off-by: NBartosz Golaszewski <bgolaszewski@baylibre.com> Signed-off-by: NSrinivas Kandagatla <srinivas.kandagatla@linaro.org> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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