lib: Rewrite qemu-armv7 ramdetect

* Move armv7 RAM dection to a common place
* Enable it for all emulated platforms
* Use 32bit probe values and restore memory even on failure
* Use the new logic on the following boards:
** qemu-armv7
** qemu-riscv

Tested on qemu-system-riscv:
Fixes kernel panic due to wrong memory limits reported.

Change-Id: I37386c6a95bfc3b7b25aeae32c6e14cff9913513
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/33934
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
diff --git a/src/mainboard/emulation/qemu-armv7/mainboard.c b/src/mainboard/emulation/qemu-armv7/mainboard.c
index cc14dd8..338cff9 100644
--- a/src/mainboard/emulation/qemu-armv7/mainboard.c
+++ b/src/mainboard/emulation/qemu-armv7/mainboard.c
@@ -18,9 +18,10 @@
 #include <device/device.h>
 #include <cbmem.h>
 #include <halt.h>
-#include "mainboard.h"
 #include <edid.h>
 #include <device/mmio.h>
+#include <ramdetect.h>
+#include <symbols.h>
 
 static void init_gfx(void)
 {
@@ -57,7 +58,7 @@
 		halt();
 	}
 
-	discovered = probe_ramsize();
+	discovered = probe_ramsize((uintptr_t)_dram, CONFIG_DRAM_SIZE_MB);
 	printk(BIOS_DEBUG, "%d MiB of RAM discovered\n", discovered);
 	ram_resource(dev, 0, 0x60000000 >> 10, discovered << 10);
 	cbmem_recovery(0);