common/sfc_efx: update copyright year

Bump copyright year to 2021.

Signed-off-by: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>

net/sfc: move MCDI helpers to common driver

These helper will be reused by other libefx consumers, e.g. vDPA
driver.

Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>
Reviewed-by: Andy Mo

net/sfc: move MCDI helpers to common driver

These helper will be reused by other libefx consumers, e.g. vDPA
driver.

Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>
Reviewed-by: Andy Moreton <amoreton@xilinx.com>

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