taoshan: remove obsolete logo.rle

Since device/sony/common/resources.mk gets inherited, the logo.rle from device/sony/common/bootlogo gets copied to the root directory. As a result, this logo.rle is not needed. Bootlogos for the Sony Xperia L have already been added in commit https://github.com/CyanogenMod/android_device_sony_common/commit/00ebf4bd3c43de6f2a47b8ea9391d7559203ee5e.