feat(rcar): rewrite console_renesas_register() in C

Replace assembler implementation of console_renesas_register() with
matching C implementation. Since it is now easily possible to pass
flags into

feat(rcar): rewrite console_renesas_register() in C

Replace assembler implementation of console_renesas_register() with
matching C implementation. Since it is now easily possible to pass
flags into console_renesas_register() and then onward to the console
initialization, adjust the signature of console_renesas_register()
and include the flags in it. Adjust both rcar_console_boot_init()
and rcar_console_runtime_init() to call console_renesas_register()
with its new combined set of parameters and drop console_set_scope()
invocation which is no longer needed, because the flags are passed
directly into console_renesas_register().

Drop console_renesas_flush() which is always a noop. Drop return
value from console_renesas_init() which is always 1.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Change-Id: I1c7d1a81b6922138b6e2e80f2635fcc8558685c7

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refactor(rcar): rename console_rcar_ to console_renesas_ prefix for Renesas platform

Rename console_rcar_ to console_renesas_ prefix for SCIF-based console
driver to make it reusable by other Renesa

refactor(rcar): rename console_rcar_ to console_renesas_ prefix for Renesas platform

Rename console_rcar_ to console_renesas_ prefix for SCIF-based console
driver to make it reusable by other Renesas platforms.

Due to the above renaming, function console_renesas_register is duplicated
in both scif.h and console.h, so it should be removed from scif.h

Change-Id: I42b44d1786578f7ed8db34e7da421836ea60b5e2
Signed-off-by: Nhut Nguyen <nhut.nguyen.kc@renesas.com>

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