linux-guf: Upgrade kernel to 5.10.104

Update the kernel to 5.10.104. This should pull the latest security
fixes, i.e. for CVE-2022-0847.

With this it seems to be necessary to disable
CONFIG_STACKPROTECTOR_PER_TASK to build it inside Yocto dunfell.
It seems to be a problem of missing headers inside gcc-plugin.

Remove the PREFERRED kernel variables from imx6ull, that are derived
from guf.inc.

BCS 746-000735

conf/machine/imx6ullguf.conf

@@ -9,9 +9,6 @@ require conf/machine/include/tune-cortexa7.inc
 MACHINEOVERRIDES =. "imxpxp:"
 SOC_FAMILY = "imx:mx6:mx6ull"
 
-PREFERRED_PROVIDER_virtual/kernel ?= "linux-guf"
-PREFERRED_VERSION_linux-guf ?= "5.10.57"
-
 MACHINE_ESSENTIAL_EXTRA_RDEPENDS += " \
     kernel-module-imx6-spreadspectrum \
 "

conf/machine/include/guf.inc

 require conf/machine/include/soc-family.inc
 
 PREFERRED_PROVIDER_virtual/kernel ??= "linux-guf"
-PREFERRED_VERSION_linux-guf ??= "5.10.57"
+PREFERRED_VERSION_linux-guf ??= "5.10.104"
 KERNEL_IMAGETYPE = "uImage"
 
 KBUILD_BUILD_USER := "support"

recipes-kernel/linux/linux-guf_5.10.bb

@@ -11,7 +11,7 @@ FILESEXTRAPATHS_prepend := "${THISDIR}/linux-guf-${LINUX_VERSION}:"
 
 S = "${WORKDIR}/git"
 
-PV = "5.10.57"
+PV = "5.10.104"
 SRCREV = "${AUTOREV}"
 
 LIC_FILES_CHKSUM = "file://COPYING;md5=6bc538ed5bd9a7fc9398086aedcd7e46"