Update kernel arguments in grub boot loader

Check current kernel command line arguments: 

#grubby --info=ALL | less

Update the kernel command line arguments here: (GRUB_CMDLINE_LINUX)
# vim /etc/default/grub 

Propagate the changes:

#grub2-mkconfig -o /boot/grub2/grub.cfg 

Now, verify the changes:

#grubby --info=ALL |less