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You can refer to the following methods, but we can not guarantee that you can use it. First ,you must clone the latest Andorid5.1 source code , then according to the following steps to modify.
1. enter this path: framework/base/core/res/res/values/config.xml
config_lidOpenRotation = 0 ;----> config_lidOpenRotation = 90 ;
2.enter this path : framework/base/services/core/java/com/android/server/wm/WindowMangerService.java
int mRotation = 0 ;-----> int mRotation = 1 ;
3. and in this path : framework/base/services/surfaceflinger/DisplayDevice.cpp
setProjection(Displaystate::eOrientationDefault, mViewprot ,mFrame )------>
setProjection( Displaystate::eOrientation90 ,mViewprot , mFrame )

After compiling the source code, you need to refer to wiki to replace the file system which on board.
But it also has some problem on display, so you need to do some edits.

1. framework/base/cmds/bootanimation/BootAnimation.cpp
In this function : status_t BootAnimation::readyToRun
Modify the code: spcontrol=session()- >createsurface(String8("BootAnimation"),dinfo.w,dinfo.h.PIXEL_FORMAT_RGB_565);
as ：
spcontrol=session()- >createsurface(String8"BootAnimation"),dinfo.h,dinfo.w.PIXEL_FORMAT_RGB_565);
2. /framework/native/services/surfaceflinger/DisplayDevice.cpp
Modify this function:


void DisplayDevice::setProjection(intorientation, conts Rect&newViewport,constRect&newFrame)中
if(!frame.isValid()){
frame = Rect(w,h);----->frame = Rect(h,w);
}
In Transform R, add this code:
orientation = DisplayState::eorientation90;

3. /framework/native/services/surfaceflinger/surfaceFlinger.cpp
Modify the function
voidSurfaceFlinger::onInitializeDisplay()：
d.orientation = DisplayState::eOrientationDefault ;----->d.orientation=DisplayState::eOrientatio90;

Last ,compile the source code and replace it .