feat(build): add Mbed TLS submodule

This change adds Mbed TLS 3.6.5 as a submodule to the TF-A repository.
It is no longer a requirement to pass `MBEDTLS_DIR` to the build system
when building confi

feat(build): add Mbed TLS submodule

This change adds Mbed TLS 3.6.5 as a submodule to the TF-A repository.
It is no longer a requirement to pass `MBEDTLS_DIR` to the build system
when building configurations which require it, as the build system will
now look inside the `contrib` directory if the parameter is missing.

If you cloned TF-A without the `--recurse-submodules` flag, you can
ensure that this submodule is present by running:

git submodule update --init --recursive

BREAKING-CHANGE: Mbed TLS is now included in the TF-A repository, and it
is no longer a requirement to pass `MBEDTLS_DIR` to the build system.
Please run `git submodule update --init --recursive` if you encounter
issues after migrating to the latest version of TF-A.

Change-Id: Iad777e77936d1c373065f17fe5c4aadc45e56b64
Signed-off-by: Chris Kay <chris.kay@arm.com>

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fix(brcm): fix bad Mbed TLS check

The Broadcom platforms check for the presence of Mbed TLS by chopping
off the final part of `MBEDTLS_DIR`, then searching the Mbed TLS include
directory for it.

Th

fix(brcm): fix bad Mbed TLS check

The Broadcom platforms check for the presence of Mbed TLS by chopping
off the final part of `MBEDTLS_DIR`, then searching the Mbed TLS include
directory for it.

This works only if the stem of `MBEDTLS_DIR` happens to match `mbedtls`,
as Mbed TLS 3.6.5 *does* provide an `include/mbedtls` directory. In the
case where Mbed TLS has been downloaded to any other name, its path is
ignored and the platform builds without support for Trusted Board Boot.

Fix this check by explicitly testing the presence of `$(MBEDTLS_DIR)`.

Change-Id: I0eb24083084d98ed3c5f536c082cc3999086beeb
Signed-off-by: Chris Kay <chris.kay@arm.com>

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feat(auth): introducing auth.mk

Introducing authentication specific makefile auth.mk to include common
auth source files.

Signed-off-by: Lauren Wehrmeister <lauren.wehrmeister@arm.com>
Change-Id: I

feat(auth): introducing auth.mk

Introducing authentication specific makefile auth.mk to include common
auth source files.

Signed-off-by: Lauren Wehrmeister <lauren.wehrmeister@arm.com>
Change-Id: Ifb07c48861fe415d82cb7390c3a5f6e60ba699d9

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chore(brcm): include cpu_helpers.S for bl2 build

With errata conversion in place for Cortex_A72 cpu,
build fails with undefined reference to functions defined
in cpu_helpers.S file.
Including the sa

chore(brcm): include cpu_helpers.S for bl2 build

With errata conversion in place for Cortex_A72 cpu,
build fails with undefined reference to functions defined
in cpu_helpers.S file.
Including the same to handle build issues related to
Stingray platform.

Change-Id: I2bab3e5ca0811d83cd9ee43ac33d557afe6575a8
Signed-off-by: Jayanth Dodderi Chidanand <jayanthdodderi.chidanand@arm.com>

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