Combine Travis CI option-setting commands (#12474)

.travis.yml

Marlin/src/HAL/HAL_AVR/SanityCheck.h

Marlin/src/lcd/HD44780/ultralcd_HD44780.cpp

Marlin/src/lcd/dogm/status_screen_DOGM.cpp

Marlin/src/lcd/menu/menu.cpp

Marlin/src/lcd/menu/menu_configuration.cpp

Marlin/src/lcd/ultralcd.h

buildroot/bin/opt_add

buildroot/bin/opt_add_adv

buildroot/bin/opt_disable

buildroot/bin/opt_disable_adv

buildroot/bin/opt_enable

buildroot/bin/opt_enable_adv

buildroot/bin/opt_set

buildroot/bin/opt_set_adv

buildroot/share/tests/DUE_tests

buildroot/share/tests/LPC1768_tests

buildroot/share/tests/STM32F1_tests

buildroot/share/tests/megaatmega2560_tests

buildroot/share/tests/teensy35_tests