rk3308: loader: Add spinor only version

from commit:
e24e370a src: rockusb: RK3308 spinor idblock 2 copies.
update feature:
Add spinor only version.

Change-Id: I54c63ebf68660e31eb165eb55cc2fda09f

rk3308: loader: Add spinor only version

from commit:
e24e370a src: rockusb: RK3308 spinor idblock 2 copies.
update feature:
Add spinor only version.

Change-Id: I54c63ebf68660e31eb165eb55cc2fda09f8ee906
Signed-off-by: Jon Lin <jon.lin@rock-chips.com>

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