arm/dt: 8610: Increase EBI1 buffer reservation size

Currently contiguous memory allocation fails for CoreSight TMC
driver since attempt to allocate memory is more than what is
reserved. Introduce temporary fix by increasing the total
memory reservation request until fix for allocation without
reservation goes in.

Change-Id: I97703a4606181bbab008cca36eb84629513b9074
Signed-off-by: Aparna Das <adas@codeaurora.org>