ARM64 Platform support for R8A77990 (R-Car E3)

configname: CONFIG_ARCH_R8A77990

Linux Kernel Configuration
└─>Device Drivers
└─>SOC (System On Chip) specific Drivers
└─>Renesas SoC driver support
└─>ARM64 Platform support for R8A77990 (R-Car E3)
In linux kernel since version 3.10 (release Date: 2013-06-30)  
This enables support for the Renesas R-Car E3 SoC.
This includes different gradings like R-Car E3e.