kernel: Remove kernel.xml (6.1 kernel)

On Android 15, we only use 6.6 kernel.

In order to support future kernel as well, keep the -6.6.xml suffix.

Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>

kernel.xml

-<?xml version="1.0" encoding="UTF-8"?>
-<manifest>
-  <remote name="aosp"
-          fetch="https://android.googlesource.com"
-          review="https://android-review.googlesource.com/" />
-  <remote name="baylibre"
-          fetch="https://gitlab.baylibre.com/baylibre/ti/" />
-  <default revision="main-kernel-build-2023" remote="aosp" sync-j="4" />
-
-  <superproject name="kernel/superproject" remote="aosp" revision="common-android14-6.1-2024-06" />
-
-  <project path="build/kernel" name="kernel/build">
-    <linkfile src="kleaf/bazel.sh" dest="tools/bazel" />
-    <linkfile src="kleaf/bazel.WORKSPACE" dest="WORKSPACE" />
-    <linkfile src="build_test.sh" dest="build/build_test.sh" />
-    <linkfile src="config.sh" dest="build/config.sh" />
-  </project>
-  <project path="common" name="kernel/common" revision="android14-6.1-2023-11" upstream="android14-6.1-2023-11" dest-branch="android14-6.1-2023-11" />
-  <project path="kernel/tests" name="kernel/tests" />
-  <project path="kernel/configs" name="kernel/configs" />
-  <project path="common-modules/virtual-device" name="kernel/common-modules/virtual-device" revision="31d55ad282832dbc009bc3b17deed6537c6ac969" upstream="android14-6.1" dest-branch="android14-6.1" />
-  <project path="prebuilts/clang/host/linux-x86" name="platform/prebuilts/clang/host/linux-x86" clone-depth="1" />
-  <project path="prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.17-4.8" name="platform/prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.17-4.8" clone-depth="1" />
-  <project path="prebuilts/build-tools" name="platform/prebuilts/build-tools" clone-depth="1" />
-  <project path="prebuilts/clang-tools" name="platform/prebuilts/clang-tools" clone-depth="1" />
-  <project path="prebuilts/kernel-build-tools" name="kernel/prebuilts/build-tools" clone-depth="1" />
-  <project path="tools/mkbootimg" name="platform/system/tools/mkbootimg" />
-
-  <project path="prebuilts/bazel/linux-x86_64" name="platform/prebuilts/bazel/linux-x86_64" clone-depth="1" />
-  <project path="prebuilts/jdk/jdk11" name="platform/prebuilts/jdk/jdk11" clone-depth="1" />
-  <project path="prebuilts/ndk-r23" name="toolchain/prebuilts/ndk/r23" clone-depth="1" />
-
-  <project path="external/bazel-skylib" name="platform/external/bazel-skylib" />
-  <project path="build/bazel_common_rules" name="platform/build/bazel_common_rules" />
-  <project path="external/stardoc" name="platform/external/stardoc" />
-  <project path="external/python/absl-py" name="platform/external/python/absl-py" />
-
-<!-- non AOSP TI Projects -->
-  <remove-project name="kernel/common" />
-  <project path="common" name="ti-linux-kernel.git" remote="baylibre" revision="integ/ti-android-linux-6.1.y" groups="ti" />
-  <project path="imgtech-module" name="imgtech-ddk-driver.git" remote="baylibre" revision="linuxws/scarthgap/k6.6/24.1.6554834" groups="ti" />
-</manifest>