mips: mtmips: add predefined i-cache/d-cache size and linesize

Both mt7620 and mt7628 has the same cache configuration. There is no need
to use CONFIG_SYS_CACHE_SIZE_AUTO to probe it at runtime.

Add them into Kconfig to reduce some code size.

Reviewed-by: Stefan Roese <sr@denx.de>
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
diff --git a/arch/mips/mach-mtmips/Kconfig b/arch/mips/mach-mtmips/Kconfig
index c8dcf19..8e10719 100644
--- a/arch/mips/mach-mtmips/Kconfig
+++ b/arch/mips/mach-mtmips/Kconfig
@@ -7,6 +7,18 @@
 config SYS_SOC
 	default "mt7628" if SOC_MT7628
 
+config SYS_DCACHE_SIZE
+	default 32768
+
+config SYS_DCACHE_LINE_SIZE
+	default 32
+
+config SYS_ICACHE_SIZE
+	default 65536
+
+config SYS_ICACHE_LINE_SIZE
+	default 32
+
 choice
 	prompt "MediaTek MIPS SoC select"