feat(rcar): add support for Renesas R-Car S4 / V4H / V4M

Add support for Renesas R-Car S4 / V4H / V4M , which are Gen4 SoC.
Add platform code, BL31 setup code, platform specific PSCI handlers,
CPU p

feat(rcar): add support for Renesas R-Car S4 / V4H / V4M

Add support for Renesas R-Car S4 / V4H / V4M , which are Gen4 SoC.
Add platform code, BL31 setup code, platform specific PSCI handlers,
CPU power driver, Gen4 (H)SCIF driver, and function to get canary for
stack protector. Unlike Gen3, the Gen4 uses only TFA BL31 during boot.

Change-Id: Ic0eb8638a85757f997f29fc524c118c3e5d5135a
Signed-off-by: Hideyuki Nitta <hideyuki.nitta.jf@hitachi.com>
Signed-off-by: Hieu Nguyen <hieu.nguyen.dn@renesas.com>
Signed-off-by: Jing Dan <jing.dan.nx@renesas.com>
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Signed-off-by: Masashi Ozaki <masashi.ozaki.te@renesas.com>
Signed-off-by: Taichiro Yokoyama <taichiro.yokoyama.ns@hitachi.com>
Signed-off-by: Takeshi Kihara <takeshi.kihara.df@renesas.com>
Signed-off-by: Toshiyuki Ogasahara <toshiyuki.ogasahara.bo@hitachi.com>
Signed-off-by: Tsukasa Kawaguchi <tsukasa.kawaguchi.aw@hitachi.com>
Signed-off-by: Valentine Barshak <valentine.barshak@cogentembedded.com>
Signed-off-by: Vincent Bryce <vincent.bryce@cogentembedded.com>
Signed-off-by: Yoshifumi Hosoya <yoshifumi.hosoya.wj@renesas.com>
---
NOTE: This patch is squashed and cleaned up from large stack of patches
from multiple authors. SoB line from each author is included here,
the author of this commit is set to myself although that is most
certainly not accurate.

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