global: Remove leading/trailing blank lines in files

Remove leading/trailing blank lines in .c, .h, .py, .rst, .yml, and
.yaml files.

Will avoid failures with the new CI test in
https://github.com/zephyrproject-rtos/ci-tools/pull/112, though it only
checks changed files.

Move the 'target-notes' target in boards/xtensa/odroid_go/doc/index.rst
to get rid of the trailing blank line there. It was probably misplaced.

Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>

tests/lib/gui/lvgl/src/img.c

@@ -135,4 +135,3 @@ const lv_img_dsc_t *get_lvgl_img(void)
 {
 	return &img_dsc;
 }
-

tests/lib/gui/lvgl/src/main.c

@@ -142,4 +142,3 @@ void test_main(void)
 	ztest_run_test_suite(lvgl_screen);
 	ztest_run_test_suite(lvgl_fs);
 }
-