This patch memmaps all the IRAM memory banks during boot. The BPMP
firmware might place the channels in any of the IRAMs, so it is better
to map all the banks to avoid surprises.

Change-Id: Ia009a65d227ee50fbb23e511ce509daf41b877ee
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>