irqdomain/powerpc: updated defconfigs for VIRQ_DEBUG rename

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
diff --git a/arch/powerpc/configs/ppc64_defconfig b/arch/powerpc/configs/ppc64_defconfig
index 1acf650..c1442a3 100644
--- a/arch/powerpc/configs/ppc64_defconfig
+++ b/arch/powerpc/configs/ppc64_defconfig
@@ -457,7 +457,7 @@
 CONFIG_FTR_FIXUP_SELFTEST=y
 CONFIG_MSI_BITMAP_SELFTEST=y
 CONFIG_XMON=y
-CONFIG_VIRQ_DEBUG=y
+CONFIG_IRQ_DOMAIN_DEBUG=y
 CONFIG_BOOTX_TEXT=y
 CONFIG_CRYPTO_NULL=m
 CONFIG_CRYPTO_TEST=m