ARM: dts: Rename model name from Qualcomm to QTI

Qualcomm Technologies, Inc. (QTI) is the actual hardware
manufacturing entity of Qualcomm. Change the model name
to reflect the correct name for all the dts(i) files.
Also, change the board name specified in the machine
macros and module descriptions.

Change-Id: I1f946a02421556f702ca40f5c3c18ec7faac346b
Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>