Drop FIX_RTC flag from FADT.

FIX_RTC flag should be set if RTC wake status is _not_ reported in fixed
register space, but this is not the case for QEMU. So drop it from FADT.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
diff --git a/src/acpi.c b/src/acpi.c
index 6174e04..30888b9 100644
--- a/src/acpi.c
+++ b/src/acpi.c
@@ -294,8 +294,8 @@
     fadt->plvl2_lat = cpu_to_le16(0xfff); // C2 state not supported
     fadt->plvl3_lat = cpu_to_le16(0xfff); // C3 state not supported
     pci_init_device(fadt_init_tbl, pci, fadt);
-    /* WBINVD + PROC_C1 + SLP_BUTTON + FIX_RTC + RTC_S4 */
-    fadt->flags = cpu_to_le32((1 << 0) | (1 << 2) | (1 << 5) | (1 << 6) | (1 << 7));
+    /* WBINVD + PROC_C1 + SLP_BUTTON + RTC_S4 */
+    fadt->flags = cpu_to_le32((1 << 0) | (1 << 2) | (1 << 5) | (1 << 7));
 
     build_header((void*)fadt, FACP_SIGNATURE, sizeof(*fadt), 1);