configs/linux: Add CONFIG_PCI_MSI to skiroot_defconfig

Signed-off-by: Sam Mendoza-Jonas <sam@mendozajonas.com>
diff --git a/openpower/configs/linux/skiroot_defconfig b/openpower/configs/linux/skiroot_defconfig
index 06fbd7c..cc7a51d 100644
--- a/openpower/configs/linux/skiroot_defconfig
+++ b/openpower/configs/linux/skiroot_defconfig
@@ -216,3 +216,4 @@
 # CONFIG_CRYPTO_HW is not set
 CONFIG_MTD=y
 CONFIG_MTD_POWERNV_FLASH=y
+CONFIG_PCI_MSI=y