refactor(arm): rename ARM_ROTPK_HEADER_LEN

This variable had a misleading name, as it is the length
of the header only when the ROTPK is a hash.
Also rename arm_rotpk_header to match the new pattern

refactor(arm): rename ARM_ROTPK_HEADER_LEN

This variable had a misleading name, as it is the length
of the header only when the ROTPK is a hash.
Also rename arm_rotpk_header to match the new pattern.

Change-Id: I36c29998eebf50c356a6ca959ec9223c8837b540
Signed-off-by: Ryan Everett <ryan.everett@arm.com>

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feat(arm): use the provided hash alg to hash rotpk

No longer hard code SHA-256 hashed dev rotpks, instead
use the algorithm given by HASH_ALG. This means that
we no longer need the plat_arm_configs

feat(arm): use the provided hash alg to hash rotpk

No longer hard code SHA-256 hashed dev rotpks, instead
use the algorithm given by HASH_ALG. This means that
we no longer need the plat_arm_configs (once the protpk and
swd_rotpk are also updated to use HASH_ALG).

The rot public key is now generated at build time, as is
the header for the key.

Also support some default 3k and 4k RSA keys.

Change-Id: I33538124aeb4fa7d67918d878d17f2a84d3a6756
Signed-off-by: Ryan Everett <ryan.everett@arm.com>

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fix(rotpk): move rotpk definitions out of arm_def.h

The file arm_def.h currently contains common definitions used by ARM
platforms. However, some platforms may have their own definitions,
allowing t

fix(rotpk): move rotpk definitions out of arm_def.h

The file arm_def.h currently contains common definitions used by ARM
platforms. However, some platforms may have their own definitions,
allowing them to avoid a direct dependency on arm_def.h. For a clean
platform port of arm_def.h, none of the source files should directly
include arm_def.h; instead, they should include the platform header
which would indirectly include the required definitions.

Presently, the rotpk module has a source file that directly includes
arm_def.h. This could lead to compilation issues if the platform
incorporating the rotpk module has a separate implementation of some or
all of the definitions in arm_def.h file. To address this, move the
relevant definitions out of arm_def.h and into rotpk_def.h.

Signed-off-by: Rohit Mathew <Rohit.Mathew@arm.com>
Change-Id: I9e8b0d319391f9a167af5c69a7b2d42ac488e7b4

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