MIPS: Make CONFIG_SYS_DCACHE_LINE_SIZE int, not hex

For consistency with the other cache-related Kconfig entries & the
values actually set by boards, make CONFIG_SYS_DCACHE_LINE_SIZE an int
entry instead of a hex entry.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Fixes: 372286217f05 ("MIPS: Split I & D cache line size config")
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 5c30ae9..21066f0 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -253,7 +253,7 @@
 	  The total size of the L1 Dcache, if known at compile time.
 
 config SYS_DCACHE_LINE_SIZE
-	hex
+	int
 	default 0
 	help
 	  The size of L1 Dcache lines, if known at compile time.