rk3568: loader: Update to v1.15

from commit:
65048d1 platform: rk3568: Update to v1.15
update feature:
Support new spiflash

Change-Id: I4fbcdb5c5b619f47c5600f2b2332fcbcdbb79d78
Signed-off-by: Jon

rk3568: loader: Update to v1.15

from commit:
65048d1 platform: rk3568: Update to v1.15
update feature:
Support new spiflash

Change-Id: I4fbcdb5c5b619f47c5600f2b2332fcbcdbb79d78
Signed-off-by: Jon Lin <jon.lin@rock-chips.com>

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