MIPS: asm: cpu: Add cpu flag for Enhanced Virtual Addressing

The MIPS *Aptiv family uses bit 28 in Config5 CP0 register to
indicate whether the core supports EVA or not.

Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>

diff --cc arch/mips/include/asm/cpu-features.h
Simple merge

diff --cc arch/mips/include/asm/cpu.h
Simple merge