Add support for identifying the R-Car H3Ne-1.7G (R8A779MB) SoC.

As this is a different grading of the already supported R-Car H3-N ES3.0
(R8A77951) SoC, support for it is enabled through the existing
ARCH_R8A77951 configuration symbol.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/8670482178567897571edc0dfc60017453544071.1656072871.git.geert+renesas@glider.be