meta-android: kernel_android.bbclass: use global machine variable for boot partition

Signed-off-by: Simon Busch <morphis@gravedo.de>
meta-asus: conf: grouper: specify ANDROID_BOARD_BOOTIMAGE_PARTITION

Signed-off-by: Simon Busch <morphis@gravedo.de>
meta-samsung: conf: tuna: specify ANDROID_BOARD_BOOTIMAGE_PARTITION

Signed-off-by: Simon Busch <morphis@gravedo.de>
meta-samsung: linux-samsung-tuna: bump SRCREV and update defconfig

* enable CONFIG_FB_OMAP2_VSYNC_SYSFS

Signed-off-by: Simon Busch <morphis@gravedo.de>
meta-samsung/meta-asus: update android-system-image for maguro and grouper machines

Signed-off-by: Simon Busch <morphis@gravedo.de>