[perso] Send back CWT UDS certificate from host to device during provisioning

[xorptr]

Currently, during provisioning the device firmware generates CWT UDS certificate during pre-endorsement stage. The host does not send it back with other endorsed certificates, so during the post-endorsement stage the device uses data from the blob it sent to the host. This necessitates keeping both the blob sent to the host and blob received from the host live during the post-endorsement stage.

This PR changes the provisioning flow so that the host sends CWT UDS certificate back to the device (without doing any endorsement, which is similar to existing behavior). This allows splitting the perso blob to host and perso blob from host into stage specific union variables. This saves ~5KiB space in .bss section in SRAM. NOTE: This assumes that the pre-endorsement SKU extension logic will not keep any references to the blob sent to the host for use during post-endorsement SKU extension logic.

Changes are on top on PR #31033

Output from bloaty for .bss section in ft_personalize_emulation_dice_mldsa_sim_qemu_rom_with_fake_keys.elf before this change:

   0.0%       0  17.7%  27.4Ki    .bss
     NAN%       0  75.5%  20.7Ki    provision.perso_data
     NAN%       0  14.6%  4.00Ki    owner_page
     NAN%       0   7.2%  1.97Ki    main_spi_buf
     NAN%       0   1.0%     272    ottf_console_spi_getc.info
     NAN%       0   0.4%     100    pxReadyTasksLists
     NAN%       0   0.2%      52    main_console
     NAN%       0   0.1%      40    status_report_list
     NAN%       0   0.1%      24    rand_testutils_rng_ctx
     NAN%       0   0.1%      20    xDelayedTaskList1
     NAN%       0   0.1%      20    xDelayedTaskList2
     NAN%       0   0.1%      20    xPendingReadyList
     NAN%       0   0.1%      20    xSuspendedTaskList
     NAN%       0   0.1%      20    xTasksWaitingTermination

Output from bloaty for .bss section in ft_personalize_emulation_dice_mldsa_sim_qemu_rom_with_fake_keys.elf after this change:

   0.0%       0  14.9%  22.4Ki    .bss
     NAN%       0  70.0%  15.7Ki    provision.perso_data
     NAN%       0  17.8%  4.00Ki    owner_page
     NAN%       0   8.8%  1.97Ki    main_spi_buf
     NAN%       0   1.2%     272    ottf_console_spi_getc.info
     NAN%       0   0.4%     100    pxReadyTasksLists
     NAN%       0   0.2%      52    main_console
     NAN%       0   0.2%      40    status_report_list
     NAN%       0   0.1%      24    rand_testutils_rng_ctx
     NAN%       0   0.1%      20    xDelayedTaskList1

[sasdf]

Q: should we also reset the next_free here?

[xorptr]

Yes, I did that in a later commit (b613f53) in PR #31038

[cfrantz]

We need to determine if this change has any impact on the ot-provisioning infrastructure.

[timothytrippel]

please rebase to fix CI

[xorptr]

Rebased on top of last commit in PR #31033 (a3aef4ea32ce0bb3562155c50aa46c4cb748593a)