bootlogo: add support for static bootlogo

Some users have bad blocks on boot partition, making impossible to install kernels with increased size.
Allow saving some space from animated bootlogo.

Signed-off-by: Michael Bestas <mikeioannina@gmail.com>

Change-Id: Ibe2c532b2419af4474a0b96eddcd484b8b7ffe08
Merge https://github.com/LegacyXperia/android_device_semc_msm7x30-common into jb-4.2