mb/emulation/qemu-riscv: Fix regression

Fix regression introduced in bd4bcab
"lib: Rewrite qemu-armv7 ramdetect".

The detected DRAM size is in MiB, thus needs to adjusted accordingly
before passed to ram_resource.

Wasn't seen earlier as everything works, except payload loading.

Change-Id: I4931372f530e7b4e453a01e5595d15d95a544803
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34601
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
diff --git a/src/mainboard/emulation/qemu-riscv/mainboard.c b/src/mainboard/emulation/qemu-riscv/mainboard.c
index 02356aa..88898087 100644
--- a/src/mainboard/emulation/qemu-riscv/mainboard.c
+++ b/src/mainboard/emulation/qemu-riscv/mainboard.c
@@ -28,7 +28,7 @@
 	}
 
 	dram_mb_detected = probe_ramsize((uintptr_t)_dram, CONFIG_DRAM_SIZE_MB);
-	ram_resource(dev, 0, (uintptr_t)_dram / KiB, dram_mb_detected / KiB);
+	ram_resource(dev, 0, (uintptr_t)_dram / KiB, dram_mb_detected * MiB / KiB);
 
 	cbmem_recovery(0);
 }