MIPS: Malta: Enable CM & L2 support

Enable support for the MIPS Coherence Manager & L2 caches on the MIPS
Malta board, removing the need for us to attempt to bypass the L2 during
boot (which would fail with recent CPUs that expose L2 config via the CM
anyway).

Signed-off-by: Paul Burton <paul.burton@imgtec.com>

arch/mips/Kconfig

@@ -26,6 +26,8 @@ config TARGET_MALTA
 	select DM
 	select DM_SERIAL
 	select DYNAMIC_IO_PORT_BASE
+	select MIPS_CM
+	select MIPS_L2_CACHE
 	select OF_CONTROL
 	select OF_ISA_BUS
 	select SUPPORTS_BIG_ENDIAN

board/imgtec/malta/lowlevel_init.S

@@ -28,12 +28,6 @@
 
 	.globl	lowlevel_init
 lowlevel_init:
-	/* disable any L2 cache for now */
-	sync
-	mfc0	t0, CP0_CONFIG, 2
-	ori	t0, t0, 0x1 << 12
-	mtc0	t0, CP0_CONFIG, 2
-
 	/* detect the core card */
 	PTR_LI	t0, CKSEG1ADDR(MALTA_REVISION)
 	lw	t0, 0(t0)