feat(k3low): add BL1 platform definitions and integration for AM62L

AM62L devices use BL1 to configure DDR4/LPDDR4 before the secondary
bootloader. This patch wires all prior DDR and board patches i

feat(k3low): add BL1 platform definitions and integration for AM62L

AM62L devices use BL1 to configure DDR4/LPDDR4 before the secondary
bootloader. This patch wires all prior DDR and board patches into a
complete, buildable bl1.bin:

- ti_platform_defs.h: add IMAGE_BL1 conditionals for BL1-specific
stack and memory layout definitions.
- platform_def.h: add BL1 SRAM base/size and mailbox address
definitions used by am62l_bl1_setup.c.
- am62l_bl1_setup.c: BL1 platform initialisation — console, DDR
init via the Cadence/TI shim, and WFI-based handoff to the
secondary bootloader.
- platform.mk: add BL1_SOURCES, K3_LPDDR4_SOURCES, update BUILD_PLAT
and PLAT_INCLUDES to compile all DDR and BL1 sources.

Change-Id: I91e8b9e8e43a5560aa688d58e6805a7b5236de44
Signed-off-by: Hari Nagalla <hnagalla@ti.com>

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refactor(ti): move out k3/common to ti/common

This will allow us to support more platforms that share commonalities
like the k3_gicv3, console, helpers, etc.
With this new common folder location, we

refactor(ti): move out k3/common to ti/common

This will allow us to support more platforms that share commonalities
like the k3_gicv3, console, helpers, etc.
With this new common folder location, we can move the previously
created ti_bl31_setup file into the new location so it can be shared
across multiple TI SoCs when need comes.
With this, also update all copyright dates.

Change-Id: Ie4365e32cd3b4b5870fe2cd03843400506e46265
Signed-off-by: Dhruva Gole <d-gole@ti.com>

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