Port the r8a7740 restart handling from the Armadillo code
to the r8a7740 generic multiplatform case.
Signed-off-by: NMagnus Damm <damm+renesas@opensource.se>
Tested-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>