drivers: irqchip: qcom: Don't assign irq domian name

Assigning irq domain name with static string results in kernel panic
when irq domain remove call is called.

Change-Id: I4c1a85ffd803d0cfc3dae38ad6abe07422a32b4f
Signed-off-by: Sudharsan Reddy Yettapu <syepattu@codeaurora.org>
Signed-off-by: Sivasri Kumar Vanka <sivasri@codeaurora.org>