efi/libstub: remove duplicate nokaslr

The same patch was applied twice (8fca3c36 and e3111d52).

Change-Id: I2f3284d294326ec7736303374769640a1e022878
Signed-off-by: Chih-Wei Huang <cwhuang@android-x86.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>