feat(rcar): rewrite SCIF driver from assembler to C

Rewrite the SCIF driver from difficult to read assembler to plain C.
Use scif-common.c which contains putc() and flush() helper functions
to avoid

feat(rcar): rewrite SCIF driver from assembler to C

Rewrite the SCIF driver from difficult to read assembler to plain C.
Use scif-common.c which contains putc() and flush() helper functions
to avoid duplication, so only fill in the initialization code. Drop
support for external clock, which is unused. Clean up macros and drop
ones which are not referenced.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Change-Id: Ia933c505c33e133e45448c82776a17629f3df1eb

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fix(rcar3): fix CPG register code comment

Update the code comment to match referenced register.

Signed-off-by: Toshiyuki Ogasahara <toshiyuki.ogasahara.bo@hitachi.com>
Signed-off-by: Yoshifumi Hoso

fix(rcar3): fix CPG register code comment

Update the code comment to match referenced register.

Signed-off-by: Toshiyuki Ogasahara <toshiyuki.ogasahara.bo@hitachi.com>
Signed-off-by: Yoshifumi Hosoya <yoshifumi.hosoya.wj@renesas.com>
Change-Id: Ie0ddbe0bffd31794425f0967c865e2928ce8d78d

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