configs/freescale_imx8mpevk: bump BSP components to lf-6.6.23-2.0.0

configs/freescale_imx8mpevk: bump BSP components to lf-6.6.23-2.0.0

Bump ATF, U-Boot and Linux kernel to the NXP BSP lf-6.6.23-2.0.0
versions.

Also, since commit dc0f721 "package/gcc: switch to 13.x as default",
this freescale_imx8mpevk_defconfig is failing to build the Kernel
with output:

    drivers/mxc/gpu-viv/hal/os/linux/kernel/gc_hal_kernel_os.c:5675:1: error: conflicting types for '_QuerySignal' due to enum/integer mismatch; have 'gceSTATUS(struct _gckOS *, void *)' {aka 'enum _gceSTATUS(struct _gckOS *, void *)'} [-Werror=enum-int-mismatch]
     5675 | _QuerySignal(IN gckOS Os, IN gctSIGNAL Signal)
          | ^~~~~~~~~~~~

This commit fixes the issue by updating the Kernel.

This commit also adds the custom version package hashes. Therefore,
BR2_DOWNLOAD_FORCE_CHECK_HASHES=y is added in the defconfig, a
BR2_GLOBAL_PATCH_DIR is also added in the board specific directory and
the hash files are added.

Fixes:
https://gitlab.com/buildroot.org/buildroot/-/jobs/7422089468

Signed-off-by: Julien Olivain <[email protected]>
Signed-off-by: Thomas Petazzoni <[email protected]>