mv:mx8mp: Add keypad_init to emission test

runtest/mv_mx8mp_emission

@@ -22,6 +22,7 @@ MMC_umount                  for i in $(mount | grep mmcblk1 | awk '{print $1}');
 USB_sticks_umount           for i in $(grep /dev/sd /proc/mounts |  awk '{print $1}'); do umount $i; done
 Touchtest_remove_socket     rm -f /touch_tst_socket
 Touchtest_start             touchmon -d -i /dev/input/event0 -s /touch_tst_socket -p 0
+Keypad_Init                 keypad_init
 
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 # TESTCASES                                                                   #