i9300: fix duplicate LIBRARIES : build fix

fix for build fails with following error:
build/core/base_rules.mk:134:
*** hardware/samsung/exynos4/hal/libcamera: MODULE.TARGET.SHARED_LIBRARIES.camera.exynos4 already defined by device/samsung/i9300/camera. Stop

Change-Id: I5bc3fd4b5ceeeb543c1193b10d5533cbc901920f
Signed-off-by: westcripp <korukaltan@gmail.com>