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fix(security): Correct key flow diagram and text around it for AM64X#654

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jsuhaas22 wants to merge 1 commit intoTexasInstruments:masterfrom
jsuhaas22:diagram-bootflow
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fix(security): Correct key flow diagram and text around it for AM64X#654
jsuhaas22 wants to merge 1 commit intoTexasInstruments:masterfrom
jsuhaas22:diagram-bootflow

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@jsuhaas22
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The key-flow diagram and the information around it in AM64X's Secure Boot page state that U-Boot uses TI-SCI to authenticate the kernel image. This is no longer the case: U-Boot verifies the kernel image using the fitImage key contained in it without invoking TIFS. Therefore change the docs to reflect this.

New diagram:
K3_KF

The key-flow diagram and the information around it in AM64X's Secure Boot page
state that U-Boot uses TI-SCI to authenticate the kernel image. This is no
longer the case: U-Boot verifies the kernel image using the fitImage key
contained in it without invoking TIFS. Therefore change the docs to reflect
this.

Signed-off-by: Suhaas Joshi <s-joshi@ti.com>
@shiva-ti
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@jsuhaas22 let's enable the secure boot doc for am62x platforms in general, for am62l we should also highlight the FIT signing part

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