rockchip: rk3399: Read cpuid and generate MAC address from efuse

The rockchip-efuse driver supports the efuse found on RK3399. This
hardware block is part of the SoC and contains the CPUID, which can
be used to generate stable serial numbers and MAC addresses.

Enable the driver and reading cpuid by default for RK3399.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Reviewed-by: Christopher Obbard <chris.obbard@collabora.com>
Reviewed-by: Dragan Simic <dsimic@manjaro.org>