projects: ssd1306: add optimize flag

Optimize flag included in project, lvgl having large footprint for
flash memory

Signed-off-by: rbudai98 <robert.budai@analog.com>

Author: rbudai98

projects/ssd1306/Makefile

@@ -4,4 +4,6 @@ include ../../tools/scripts/generic_variables.mk
 
 include src.mk
 
+CFLAGS += -Os
+
 include ../../tools/scripts/generic.mk