monarudo: defconfig: update and switch governor to interactive

* be more like m7
* switch default gov to interactive, i assumed incorrectly that init
  would set this for us

Change-Id: I66729aaf552da66e8c2393d78c611f64606a0925
msm: mdp: allow overriding of splash_screen_size

Change-Id: I7705c16e5ca1f147d3ca647d02af25136f32b0ab
monarudo: update display boardfile

* enable splash screen and set splash_screen_size
* reduce minimum brightness

Change-Id: I6f321d585e9ef428f62139c2c678b12fbb22f900