rockchip: misc: read cpuid either from efuse or otp

Newer Rockchip socs use a different ip block to handle one-time-
programmable memory, so depending on what got enabled get the cpuid
from either source.

Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>