grub: Drop redundant bbappend
grub: Drop redundant bbappend

The OE-Core's morty release provides all we need for grub, so drop the
bbappend file now.

Signed-off-by: Otavio Salvador <1d31b11c1b92bf5d043d36edfe7174db39a6b891@ossystems.com.br>

UpdateHub/meta-updatehub,UpdateHub/meta-updatehub,fbertux/meta-updatehub,fbertux/meta-updatehub,fbertux/meta-updatehub,UpdateHub/meta-updatehub