msm: HTC: m7: Add support for SRE and CABC dimming

Change-Id: Idc6fb23ca1f39568bfd90deccd3ee1855a7b4eb5
msm: HTC: m7: update board files

Change-Id: Ia86433a880649876568435a66381c837e643ccc3
m7: initial import of CM m7 defconfig

Change-Id: Icc325412836c80f3728707abab9bb35295bf0b1d