Hardcode memory base address in platform.dts

go/pvm-platform says that it's 0x8000_0000. When pvmfw uses platform.dts
as a template, the base address won't be changed. Only the size (which
is set to -1 in the template) will be updated.

Bug: 249054080
Test: N/A
Change-Id: I093b3f1777fd44cf59f7b628a4e4bd68a566ce67
diff --git a/pvmfw/platform.dts b/pvmfw/platform.dts
index e6ea2cc..056fa2f 100644
--- a/pvmfw/platform.dts
+++ b/pvmfw/platform.dts
@@ -26,7 +26,7 @@
 
 	memory {
 		device_type = "memory";
-		reg = <0x00 CONFIG_SYS_SDRAM_BASE PLACEHOLDER2>;
+		reg = <0x00 0x80000000 PLACEHOLDER2>;
 	};
 
 	reserved-memory {