ARM: shmobile: r8a7794: Reserve memory as other R-Car Gen2 SoCs

Other R-Car Gen2 SoCs such as r8a7790 and r8a7791 reserve
the top 256 MiB of memory for use with CMA. Adjust the
board-less r8a7794 code to do the same.
Signed-off-by: Magnus Damm <damm+renesas@opensource.se>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/mach-shmobile/setup-r8a7794.c

@@ -28,5 +28,6 @@ DT_MACHINE_START(R8A7794_DT, "Generic R8A7794 (Flattened Device Tree)")
 	.init_early	= shmobile_init_delay,
 	.init_late	= shmobile_init_late,
 	.init_time	= rcar_gen2_timer_init,
+	.reserve	= rcar_gen2_reserve,
 	.dt_compat	= r8a7794_boards_compat_dt,
 MACHINE_END