fix(gic): init the GIC before the platform with a hook

While GIC setup is generic across platforms, its usage is not. Some
platforms won't use it at EL3, while others need to configure interrupts
(l

fix(gic): init the GIC before the platform with a hook

While GIC setup is generic across platforms, its usage is not. Some
platforms won't use it at EL3, while others need to configure interrupts
(like RAS) in the standard platform hooks. To do that, the GIC needs to
be set up and ready to use before calling the platform hooks but
currently that is only done after. Annoyingly, a handful of platforms
need to set their GIC up before initialising it necessitating the
platform hooks to be called before GIC init.

This patch resolves this contradiction by moving the general GIC setup
calls to before the platform hooks and adding a GIC-specific platform
hook just before GIC per CPU init. This way both types of platforms can
do their business at the same time.

Change-Id: I361f587ab4603162ee880addb074800cbbb97b49
Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>

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refactor: convert arm platforms to use the generic GIC driver

This reduces the code the platforms have to carry and makes their build
rules a bit simpler.

The main benefit is that plat_my_core_pos(

refactor: convert arm platforms to use the generic GIC driver

This reduces the code the platforms have to carry and makes their build
rules a bit simpler.

The main benefit is that plat_my_core_pos() no longer needs to be called
within the driver, helping with performance a bit.

Change-Id: I0b0d1d36d20d67c41c8c9dc14ade11bda6d4a6af
Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>

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refactor(arm): simplify early platform setup functions

Refactor `arm_sp_min_early_platform_setup` to accept generic
`u_register_r` values to support receiving firmware handoff boot
arguments in comm

refactor(arm): simplify early platform setup functions

Refactor `arm_sp_min_early_platform_setup` to accept generic
`u_register_r` values to support receiving firmware handoff boot
arguments in common code. This has the added benefit of simplifying the
interface into common early platform setup.

Change-Id: Idfc3d41f94f2bf3a3a0c7ca39f6b9b0013836e3a
Signed-off-by: Harrison Mutai <harrison.mutai@arm.com>

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