configs: Add rk3288_phytec_defconfig

Based on rockchip_linux_defconfig.

- Disabled SYSTEM_TRUSTED_KEYRING
- Disabled WL_ROCKCHIP
- Disabled RFKILL
- Added DP83867_PHY
- Added support for PCA9532
- Added support for MTD SPI NOR devices: MTD_SPI_NOR and MTD_M25P80
- Added support for RTC on carrier board: RTC_DRV_M41T80

Signed-off-by: Wadim Egorov <w.egorov@phytec.de>

Author: wdmegrv