MIPS: IP28: Select correct L1_CACHE_SHIFT

IP28 has 128 byte cache lines.

Signed-off-by: Thomas Bogendoerfer <[e-mail]>
Cc: [e-mail]
Patchwork: https://patchwork.linux-mips.org/patch/7548/
Signed-off-by: Ralf Baechle <[e-mail]>

arch/mips/Kconfig

···
 	# select SYS_HAS_EARLY_PRINTK
 	select SYS_SUPPORTS_64BIT_KERNEL
 	select SYS_SUPPORTS_BIG_ENDIAN
+	select MIPS_L1_CACHE_SHIFT_7
       help
         This is the SGI Indigo2 with R10000 processor.  To compile a Linux
         kernel that runs on these, say Y here.