Update ACL pin to 5219ed8a3c56db22867cc0c49db93951a7acb36d
Update ACL pin to 5219ed8a3c56db22867cc0c49db93951a7acb36d

Signed-off-by: Nikhil Raj <70dde441576cd8b053dd4c3a595f3f0b9c7a63a3@arm.com>
Change-Id: I7bc5667e9f05f700c182e1623ffee94a69f1459a

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