OMAP3: Update SDRC dram_init to always call make_cs1_contiguous()

OMAP3: Update SDRC dram_init to always call make_cs1_contiguous()

We update the comment in make_cs1_contiguous() to be a little bit
more clear (it's been copy/pasted from other silicons) and then
explain in dram_init() why we need to always try this.

Note that in the previous behavior we were always calling this on
boards that never had cs1 populated anyhow so making sure we do
this always is fine and will correct things like omap3evm detecting
an invalid amount of memory (384MB).

Signed-off-by: Tom Rini <trini@ti.com>