configs/imx6ulz_bsh_smm_m2: bump Linux to 6.12.36 and U-Boot to 2025.07

The patch bumps the Linux kernel to version 6.12.36 and U-Boot to
version 2025.07.

Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Signed-off-by: Julien Olivain <ju.o@free.fr>