Use jr as register jump instruction

Current assembler codes are inconsistent in the way of register jump
instruction usage; some use jr, some use j. Of course GNU as allows both
usages, but as can be expected from `Jump Register' the mnemonic `jr' is
more intuitive than `j'. For example, Linux doesn't have `j <reg>' usage
at all.

Signed-off-by: Shinya Kuribayashi <skuribay@ruby.dti.ne.jp>
diff --git a/board/incaip/lowlevel_init.S b/board/incaip/lowlevel_init.S
index b39f93d..08f7f21 100644
--- a/board/incaip/lowlevel_init.S
+++ b/board/incaip/lowlevel_init.S
@@ -105,7 +105,7 @@
 	li	t2, 0x684143FD
 	sw	t2, EBU_BUSCON1(t1)
 3:
-	j	ra
+	jr	ra
 	nop
 
 	.end	ebu_init
@@ -170,7 +170,7 @@
 	li	t2, 0x80000001
 	sw	t2, CGU_MUXCR(t1)
 5:
-	j	ra
+	jr	ra
 	nop
 
 	.end	cgu_init
@@ -266,7 +266,7 @@
 	li	t2, 0x00000001
 	sw	t2, MC_CTRLENA(t1)
 
-	j	ra
+	jr	ra
 	nop
 
 	.end	sdram_init
@@ -298,7 +298,7 @@
 	nop
 	move	ra, t0
 
-	j	ra
+	jr	ra
 	nop
 
 	.end	lowlevel_init