MLBEDSW-10945: Ensure correct TOSA tensor data alignment

Some flatbuffer tools are not respecting the force_align attribute.

Constant tensor data is not always aligned to 8 bytes even though
tosa.fbs has "data: [ubyte] (force_align: 8)". This casues problems
when the tensor data is accessed as int64 in Vela.

Signed-off-by: Johan Gunnarsson <johan.gunnarsson@arm.com>
Change-Id: I2e09e0ac8ce8d7e67dc5868bc121f44d1fb851b9