usb: host: pehci: Initial commit to bring in pehci driver

isp1763A is ST-E controller which communicates with MSM 8660 over
EBI2 Bus. This patch brings in the the reference driver provided
by ST-E with the following changes:
->New Makefile added to support compilation from inside kernel tree
->Remove -Werror from CFLAGS
->Fix minor compilation error because of some USB header files got
modified in b/w .28 and .35 kernel

Change-Id: Ief053d5d25848a514069302fe35d59e744ee92b5
Signed-off-by: Manu Gautam <mgautam@codeaurora.org>