Add llc_sram_enable() and llc_sram_disable() APIs to Marvell
cache_lls driver.
Add LLC_SRAM definition to Marvell common makefile - disabled
by the default.
Add description of LLC_SRAM flag to the build documentation.

Change-Id: Ib348e09752ce1206d29268ef96c9018b781db182
Signed-off-by: Konstantin Porotchkin <kostap@marvell.com>

This commit is a preparation for upcoming support for OcteonTX and
OcteonTX2 product families. Armada platform related files (docs,
plat, include/plat) are moved to the new "armada" sub-folder.

Change-Id: Icf03356187078ad6a2e56c9870992be3ca4c9655
Signed-off-by: Grzegorz Jaszczyk <jaz@semihalf.com>
Signed-off-by: Marcin Wojtas <mw@semihalf.com>