mboxd.bb: bump version

Change-Id: I8e30ad9d847dacf0e88123ef8e0d1ed3096f8ece
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/common/recipes-phosphor/mboxd/mboxd.bb b/common/recipes-phosphor/mboxd/mboxd.bb
index ac4fdc2..0a55f24 100644
--- a/common/recipes-phosphor/mboxd/mboxd.bb
+++ b/common/recipes-phosphor/mboxd/mboxd.bb
@@ -17,7 +17,7 @@
 SRC_URI += "file://99-aspeed-lpc-ctrl.rules"
 SRC_URI += "file://aspeed-lpc-ctrl-h.patch"
 
-SRCREV="9dd93cfa7309ed5fd97c47a302dc1e2d227b526e"
+SRCREV="1974c6f9e61fb194580b1874b3e88f612e5c4ba6"
 
 MBOXD_FLASH_SIZE ??= "32M"
 SYSTEMD_SUBSTITUTIONS += "FLASH_SIZE:${MBOXD_FLASH_SIZE}:${PN}.service"