arm: move irq_vector_table to common location

We don't support hard-coding vectors in this table anymore.
If someone really wants to do this, they can set
IRQ_VECTOR_TABLE_CUSTOM and define their own.

Change-Id: I45f49782ba5fefb0a02eab02ec96efd0019bc6d5
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>