machine:mx8m: Clean-up of preferred kernel

The mx8mm had a duplicate definition of the preferred kernel provider
and version.
Also the preferred version in the include for the i.MX8 devices
has been changed to the correct name (linux-imx).

conf/machine/imx8mguf.conf

@@ -5,9 +5,6 @@
 
 require include/imx8guf.inc
 
-PREFERRED_PROVIDER_virtual/kernel = "linux-imx"
-PREFERRED_VERSION_linux-imx = "5.15.5"
-
 # Support mx8mn here, as well, or is separate machine-config required for Nano ?
 SOC_FAMILY = "mx8:mx8m:mx8mm"
 ATF_PLATFORM = "imx8mm"

conf/machine/include/imx8guf.inc

@@ -61,7 +61,7 @@ UBOOT_CONFIG ??= "sd"
 #"
 
 PREFERRED_PROVIDER_virtual/kernel = "linux-imx"
-PREFERRED_VERSION:linux-seconorth = "5.15.5"
+PREFERRED_VERSION:linux-imx = "5.15.5"
 
 PREFERRED_PROVIDER:u-boot = "u-boot-imx"
 PREFERRED_PROVIDER_virtual/bootloader = "u-boot-imx"