[1/2] P31XX: move TWRP config to common

Use BoardCommonConfig.mk for main TWRP config.
Use p31xx-common.mk to place twrp.fstab inside TWRP.

Change-Id: I591d34020b996dbf009624c7e5b8edd88c3f0173
P3100: Cleanup

1. Move "DEVICE_RESOLUTION" to Common
2. Remove unneeded Package line from p3100.mk
3. Fix touchorientation in TWRP using "init.recovery.espresso.rc"
4. move init.recovery.espresso.rc and twrp.fstab inside rootdir
5. get rid of modem line in twrp.fstab
6. "preferences_prefer_dual_pane" set to false, not working in Omni
and not looking good in portrait mode on other roms

Change-Id: I3ca97cd52e24bfe22ba118b26de8e7f917ead4c5