grub: avoid mounting the read-only root filesystem

Signed-off-by: Jackie Huang <jackie.huang@windriver.com>
Signed-off-by: Babak Sarashki <Babak.SarAshki@windriver.com>

meta-stx-integ/recipes-bsp/grub/grub_2.02.bbappend

@@ -6,6 +6,8 @@ do_install_append() {
     for file in ${D}${bindir}/grub2-* ${D}${sbindir}/grub2-*; do
         ln -sf $(basename ${file}) $(echo ${file}|sed 's/grub2/grub/')
     done
+    
+    sed -i -e 's/ ro / rw /' ${D}${sysconfdir}/grub.d/10_linux
 }
 
 FILES_${PN}-editenv = "${bindir}/grub2-editenv"