drivers: cpufreq: add support for scaling available frequencies

this patch implements sysfs for scaling
between available cpu frequencies

also, it sets a safe limits during boot process

min: 200MHz
max: 1400|1600MHz

This change reverts this patch
https://gerrit.omnirom.org/#/c/5685/

Signed-off-by: Humberto Borba <humberos@gmail.com>
Change-Id: Ia424ee5fd125a9d45839091d8bd7057b8e560c15
smdk4412: Import changes for mfc driver from latest n8000 KK sources

Change-Id: Ife764f21f8cea9d0f6b3aae3436fcb7a4d07f403
smdk4412: Disable MFC memory allocation for N7100

Fixes not working video camera and broken hardware decoders/encoders
on N7100

Change-Id: I34b11421f65facffac7a09230362980739c3e6df