Revert "kernel: SRCREV bump 15e3ed4..dd52df9"

This reverts commit 42ecf7e48e6890ea5c6b4c5bdf954f0483ceecd9.

Reason for revert: b/547880205, caused kernel crash

Tested: revert
Fusion-Link: fusion2 N/A
Google-Bug-Id: 547880205
Change-Id: Ie803074e8c2c4ed9a229d8b0b18bcce4dd52625e

recipes-kernel/linux/linux-gbmc_aspeedg7.bb

diff --git a/recipes-kernel/linux/linux-gbmc_aspeedg7.bb b/recipes-kernel/linux/linux-gbmc_aspeedg7.bb
index 31c691b..cc1f771 100644
--- a/recipes-kernel/linux/linux-gbmc_aspeedg7.bb
+++ b/recipes-kernel/linux/linux-gbmc_aspeedg7.bb
@@ -8,7 +8,7 @@
 LIC_FILES_CHKSUM = "file://COPYING;md5=6bc538ed5bd9a7fc9398086aedcd7e46"
 
 SRC_URI:prepend = "git://gbmc.googlesource.com/linux;protocol=https;branch=${KBRANCH}"
-SRCREV = "dd52df9f7a7b66673b99e3840d2d02b6026ab851"
+SRCREV = "15e3ed4c88b72f3042f1a5a4ec2214bef1d20a59"
 
 SRC_URI:append:aspeed-g7 = " \
   file://aspeed-g7-gbmc.cfg \