Revert "TEMP: remoteproc: add legacy support to handle internal memories"

This reverts commit 72d0d151.

The commit 72d0d151 ("TEMP: remoteproc: add legacy support to handle
internal memories") provided a _temporary_ legacy solution for loading
into the OMAP remote processor's internal memories using a RSC_INTMEM
resource type. This is now automatically supported because of the address
translation provided by the OMAP remoteproc driver's .da_to_va() rproc
ops, and so this temporary patch is no longer needed.

Signed-off-by: Suman Anna <s-anna@ti.com>