msm9x35: display: qpic: enable interrupt for sending command

Enable interrupt usage and use it by default. Redefine
command data structure to reduce call stack. SW mode
and panel read function have been added for debugging.

Change-Id: I5eb9e5ad2df8e1cd8af868f5aa9ededafb3307f1
Signed-off-by: Ken Zhang <kenz@codeaurora.org>