rockchip: otp: split the OTP driver into different SOC platforms

The original rockchip-secure-otp.S is split into different SOC
platforms. There are including PX30, RK3308, RK3328, RK3568 and
RV1126

rockchip: otp: split the OTP driver into different SOC platforms

The original rockchip-secure-otp.S is split into different SOC
platforms. There are including PX30, RK3308, RK3328, RK3568 and
RV1126.

Add secure otp read and write support for RK3308B-S in SPL,
which is compatible with RK3308.

Signed-off-by: Nico Cheng <nico.cheng@rock-chips.com>
Change-Id: Ie0683cb2d00cfe4b32943984e12e1d7e036d1c0e

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