Revert "efi_capsule: Move signature from DTB to .rodata"

This was unfortunately applied despite much discussion about it beiong
the wrong way to implement this feature.

Revert it before too many other things are built on top of it.

This reverts commit ddf67daa.
Signed-off-by: Simon Glass <sjg@chromium.org>
41 jobs for master in 73 minutes and 10 seconds (queued for 5 seconds)
Status Name Job ID Coverage
  Testsuites
passed Build envtools #323459

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passed Build tools-only #323458

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passed Check for configs without MAINTAINERS entry #323457

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passed cppcheck #323453

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passed grep TODO/FIXME/HACK #323454

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passed htmldocs #323455

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passed Run binman, buildman, dtoc, Kconfig and patman testsuites #323460

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passed Run tests for Nokia RX-51 (aka N900) #323461

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passed sloccount #323456

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  Test.Py
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passed integratorcp_cm926ejs test.py #323468

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passed qemu_arm test.py #323469

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passed qemu-ppce500 test.py #323475

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passed r2dplus_i82557c test.py #323482

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passed r2dplus_pcnet test.py #323483

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passed r2dplus_rtl8139 test.py #323484

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passed r2dplus_tulip test.py #323485

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passed sandbox_flattree test.py #323467

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passed sandbox_noinst_test.py #323465

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passed sandbox_spl test.py #323533

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passed sandbox test.py #323462

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passed sandbox with clang test.py #323463

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passed xilinx_versal_virt test.py #323487

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passed xilinx_zynq_virt test.py #323486

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passed xtfpga test.py #323488

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failed sandbox_spl test.py #323464

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  World Build
passed build all 32bit ARM platforms #323489

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passed build all 64bit ARM platforms #323490

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passed build all other platforms #323492

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passed build all PowerPC platforms #323491

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