ARM: dts: msm: Add two wire UART support and correct irq mapping

Correct interrupt mapping as per intc and also add two wire UART
support on blsp1 uart2 instance for wifi use case.

Change-Id: Ide67df9031ffa04c2e2280cb282a78a21f22d00e
Signed-off-by: Mukesh Kumar Savaliya <msavaliy@codeaurora.org>