tuna: adapt to reserve call to dynamic changes
Since system memory size and carveouts are calculated dynamically,
omap_ion_init() calls should be invoked upfront so as the address
and sizes are initialized properly.
All omap4 board files are updated

Change-Id: I67a87e3d7973dc457d48e1df6a2277fdba09e02e
Signed-off-by: Devaraj Rangasamy <dev@ti.com>