lib: make use the same style for Makefile

Signed-off-by: Bo Shen <voice.shen@atmel.com>
sama5: android: enlarge kernel size in configuration file

As more feature enable for Android kernel, its size is larger than
3MiB, so enlarge the kernel size in configuration file

Signed-off-by: Bo Shen <voice.shen@atmel.com>