ANDROID: MTK: mtk_android_defconfig: increase the number of loop devices
The static number of loop devices to be created at init time, should be at least 16 in order to comply with VTS:
- Vts module: vts_kernel_loopconfig_test
- Vts test: KernelLoopConfigTest#ValidLoopConfig
Signed-off-by: Amjad Ouled-Ameur aouledameur@baylibre.com