refactor(qti): introduce SoC codename as Kodiak

Qualcomm has recently started using SoC codenames for upstream support
with Linux kernel being the first adoptor. Using SoC codenames for
upstream pro

refactor(qti): introduce SoC codename as Kodiak

Qualcomm has recently started using SoC codenames for upstream support
with Linux kernel being the first adoptor. Using SoC codenames for
upstream projects removes the need to follow different product names
like for kodiak which is also known as sc7280, qcm6490 etc.

Let's follow this practice of using SoC codenames for TF-A project too
beginning with Kodiak. While doing that let's refactor SoC and board
specific files where the existing support for sc7280 has been renamed to
sc7280_chrome to reflect it's usage.

Change-Id: I236fadf8ae9550f94deb05ebfed17e2ddbd69509
Signed-off-by: Sumit Garg <sumit.garg@oss.qualcomm.com>

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