IVGCVSW-3480 Add End to End test for Prelu in the CL backend
IVGCVSW-3480 Add End to End test for Prelu in the CL backend

Change-Id: Iefa78dc4c3f9d3075a8b91794eb4cf469268d946
Signed-off-by: Nikhil Raj <70dde441576cd8b053dd4c3a595f3f0b9c7a63a3@arm.com>

ARM-software/armnn,ARM-software/armnn,ARM-software/armnn