Implement device display info and get device scale factor.

Implement device display info and get device scale factor.

This patch implements basic display functionalities like display
resolution size, dip scale and rotation degrees.

Obtains the device scale factor (dsf) using device display info. The
display info computes this factor from dpi.

Reference gerrit IDs:
http://165.213.202.130/gerrit/#/c/83364/
http://165.213.202.130/gerrit/#/c/83651/
http://165.213.202.130/gerrit/#/c/85226/
http://165.213.202.130/gerrit/#/c/85236/
http://165.213.202.130/gerrit/#/c/85700/
http://165.213.202.130/gerrit/#/c/87076/

Together with: I8f6dbee2545283c3002591e4965f5c2f677fc6c9

Bug: http://web.sec.samsung.net/bugzilla/show_bug.cgi?id=14881
Bug: http://web.sec.samsung.net/bugzilla/show_bug.cgi?id=14877

Reviewed by: a1.gomes, prashant.n, sns.park

Change-Id: I22014fabf1e2ce2160be75dec4e8bdb8ecd76545
Signed-off-by: suneel <suneel.kota@samsung.com>