device/resource: Add _kb postfix for resource allocators

There is a lot of going back-and-forth with the KiB arguments, start
the work to migrate away from this.

Change-Id: I329864d36137e9a99b5640f4f504c45a02060a40
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/64658
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/mainboard/emulation/spike-riscv/mainboard.c b/src/mainboard/emulation/spike-riscv/mainboard.c
index 84a1155..2454f04 100644
--- a/src/mainboard/emulation/spike-riscv/mainboard.c
+++ b/src/mainboard/emulation/spike-riscv/mainboard.c
@@ -17,7 +17,7 @@
 		die("No dev0; die\n");
 	}
 
-	ram_resource(dev, 0, 0x80000000/KiB, ram_size/KiB);
+	ram_resource_kb(dev, 0, 0x80000000/KiB, ram_size/KiB);
 }
 
 struct chip_operations mainboard_ops = {