gitignore: Ignore emacs temporary edit files
gitignore: Ignore emacs temporary edit files

Emacs creates autosave and temporary files when editing.

These should be ignored by git.

Signed-off-by: Aaron Massey <79529a820df71f45023239a3663736629646cc34@google.com>

finikorg/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,galak/zephyr,galak/zephyr,finikorg/zephyr,finikorg/zephyr,finikorg/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr