Arm backend: Fix TOSA INT flow tensor memory store (#21398)

Tensors for TOSA INT test flow were represented as certain type of
memory store but were not contiguous in memory. This resulted in a
mismatch between representation and actual memory layout. This commit
fixes the issue by changing the memory store type to a contiguous one.


Change-Id: Ied846744b74477e76bf3e5b17db2f494072c207c

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218 @mansnils
@Sebastian-Larsson @robell @rascani

Signed-off-by: Michiel Olieslagers <michiel.olieslagers@arm.com>