oniro-linux.conf: Remove superfluous preferred version

We are assigning linux-yocto to 5.10 further down in the file.

Signed-off-by: Stefan Schmidt <stefan.schmidt@huawei.com>

meta-oniro-core/conf/distro/oniro-linux.conf

@@ -25,8 +25,6 @@ ONIRO_DEFAULT_EXTRA_RRECOMMENDS = "kernel-module-af-packet"
 
 DISTRO_FEATURES ?= "${DISTRO_FEATURES_DEFAULT} ${ONIRO_DEFAULT_DISTRO_FEATURES}"
 
-PREFERRED_VERSION_linux-yocto ?= "5.4%"
-
 SDK_NAME = "${DISTRO}-${TCLIBC}-${SDKMACHINE}-${IMAGE_BASENAME}-${TUNE_PKGARCH}-${MACHINE}"
 SDKPATHINSTALL = "/opt/${DISTRO}/${SDK_VERSION}"