[MIPS] Add missing 4KEC TLB refill handler

Early 4KEc were MIPS32r1 and therefore need some love to get a TLB
refill handler.

Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

authored by Thomas Bogendoerfer and committed by Ralf Baechle b1ec4c8e cf7b7e0b

+1
+1
arch/mips/mm/tlbex.c
··· 307 307 case CPU_R12000: 308 308 case CPU_R14000: 309 309 case CPU_4KC: 310 + case CPU_4KEC: 310 311 case CPU_SB1: 311 312 case CPU_SB1A: 312 313 case CPU_4KSC: