ARM: keystone: Merge memory.h into the only file that uses it

The defines in memory.h can go into the file that makes use of them.
No reason to have a header here, remove.

Signed-off-by: Andrew Davis <afd@ti.com>
Link: https://lore.kernel.org/r/20230726160441.101566-1-afd@ti.com


Signed-off-by: Nishanth Menon <nm@ti.com>