GPU: add optimization flags to GPU drivers

Signed-off-by: Lens-F <tnoah12@gmail.com>
Signed-off-by: flar2 <asegaert@gmail.com>
Wake Gestures: increase boot delay, add timeout to sweeps, fix irq enabled when control switched to mcu during boot delay

Signed-off-by: flar2 <asegaert@gmail.com>
GCC 4.9.1: fix compile warnings

Signed-off-by: flar2 <asegaert@gmail.com>
update defconfig