hw/pci/pci_bridge: Use the IEC binary prefix definitions

IEC binary prefixes ease code review: the unit is explicit.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20200601142930.29408-5-f4bug@amsat.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

hw/pci/pci_bridge.c

@@ -423,14 +423,14 @@ int pci_bridge_qemu_reserve_cap_init(PCIDevice *dev, int cap_offset,
     }
 
     if (res_reserve.mem_non_pref != (uint64_t)-1 &&
-        res_reserve.mem_non_pref >= (1ULL << 32)) {
+        res_reserve.mem_non_pref >= 4 * GiB) {
         error_setg(errp,
                    "PCI resource reserve cap: mem-reserve must be less than 4G");
         return -EINVAL;
     }
 
     if (res_reserve.mem_pref_32 != (uint64_t)-1 &&
-        res_reserve.mem_pref_32 >= (1ULL << 32)) {
+        res_reserve.mem_pref_32 >= 4 * GiB) {
         error_setg(errp,
                    "PCI resource reserve cap: pref32-reserve  must be less than 4G");
         return -EINVAL;