anykernel: fix ramdisk/sbin permissions

- while stock uses 750, Magisk and SuperSU both use 755 for sbin and contained binaries, so we had better do so as well

anykernel.sh

@@ -30,6 +30,7 @@ ramdisk_compression=auto;
 ## AnyKernel file attributes
 # set permissions/ownership for included ramdisk files
 chmod -R 750 $ramdisk/*;
+chmod -R 755 $ramdisk/sbin;
 chown -R root:root $ramdisk/*;