update hdmi driver:
1. rk30 hdmi ddc rate set to 50KHz.
2. flush work quene when hdmi suspend.
3. add irq enable flag to rk30 hdmi.
modify pizza2 defconfig
Merge branch 'mirror/rockchip' into radxa-dev
Merge commit 'b3e274bb306543baea83663155f3c3f5f669853d' into radxa/radxa-dev-kk