ARM: shmobile: r8a7742: Basic SoC support

Add minimal support for the RZ/G1H (R8A7742) SoC.
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Marian-Cristian Rotariu <marian-cristian.rotariu.rb@bp.renesas.com>
Link: https://lore.kernel.org/r/1587678050-23468-10-git-send-email-prabhakar.mahadev-lad.rj@bp.renesas.comSigned-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

arch/arm/mach-shmobile/setup-rcar-gen2.c

@@ -24,6 +24,7 @@
 #include "rcar-gen2.h"
 
 static const struct of_device_id cpg_matches[] __initconst = {
+	{ .compatible = "renesas,r8a7742-cpg-mssr", .data = "extal" },
 	{ .compatible = "renesas,r8a7743-cpg-mssr", .data = "extal" },
 	{ .compatible = "renesas,r8a7744-cpg-mssr", .data = "extal" },
 	{ .compatible = "renesas,r8a7790-cpg-mssr", .data = "extal" },
@@ -209,6 +210,7 @@ DT_MACHINE_START(RCAR_GEN2_DT, "Generic R-Car Gen2 (Flattened Device Tree)")
 MACHINE_END
 
 static const char * const rz_g1_boards_compat_dt[] __initconst = {
+	"renesas,r8a7742",
 	"renesas,r8a7743",
 	"renesas,r8a7744",
 	"renesas,r8a7745",