petalinux-initramfs-image.bb:add exe module script for initramfs
petalinux-initramfs-image.bb:add exe module script for initramfs

enable initramfs-module-exec script in initramfs to execute the startup scripts
which is in /exec.d directory before switching the rootfs.

This will be required in case of enabling/applying the dtbo's to enable peripherals and
then switch to rootfs of that peripheral.

Signed-off-by: Swagath Gadde <3cde48b6cfcc15a8af4aed73ea62eaf719121421@xilinx.com>

Xilinx/meta-petalinux,Xilinx/meta-petalinux,Xilinx/meta-petalinux,Xilinx/meta-petalinux,Xilinx/meta-petalinux,Xilinx/meta-petalinux