chore(rdv3): rename platform RD-Fremont to RD-V3

Arm has decided to rename RD-Fremont to RD-V3 to align with its
existing product lineup, such as RD-V1, RD-V2, etc. This change
replaces all occurences of "Fremont" with "V3" in file names and
contents.

Change-Id: I302103492f962a7ac74854633ad68701b2a7f420
Signed-off-by: Jerry Wang <Jerry.Wang4@arm.com>
23 files changed