SystemUI: Fix time without 'AM' or 'PM' in 12hour format.

The initial value of AM/PM style is 'AM_PM_STYLE_GONE' which
means the time on statusbar will not show 'AM' or 'PM'.
The time on lockscreen does not support AM/PM.

Change the initial value of AM/PM style to 'AM_PM_STYLE_NORMAL'.
About the time on lockscreen, add extra support for AM/PM:
Add layout contains AM/PM TextView to overlay, add symbol and
dimen related to layout.

Change-Id: I2f246925a4d54a94421f23cb3466b82fa61714c6
CRs-Fixed: 522239
display: tool: add splash tool for generating logo file

Add logo_gen.py for generating splash log image, it converts
PNG file to image file proper for flashing splash partition.

Change-Id: I277c18d3352977c53b702d11698fec501ffede42
Merge "display: tool: add splash tool for generating logo file"
Merge dff982302e7706064fbb7b596be63c138a0cd15e on remote branch

Change-Id: I4a78d15716d8dc835f23c7e2829db176c09874fd
Merge "Merge dff982302e7706064fbb7b596be63c138a0cd15e on remote branch"
Merge "SystemUI: Fix time without 'AM' or 'PM' in 12hour format."
Merge 2d3e3d4bbd0141483d5f0407561e3d46abb3109f on remote branch

Change-Id: Iea71983130d03b9fa5c6be5e832d85ca8014beb7
Merge "Merge 2d3e3d4bbd0141483d5f0407561e3d46abb3109f on remote branch"