Samsung defconfig changes for v5.5 1. Enable Dynamic Memory Controller driver for Exynos5422, 2. Enable Arndale (Exynos5250) audio driver, 3. Sync multi_v7 defconfig with exynos by enabling useful and necessary drivers (NFC, watchdog, S2MPA01 regulator, IOMMU, Maxim extcon drivers, PHY for SATA and devfreq).