powerpc/t4rdb: fix cpld reset altbank

cpld reset altbank should always reset to bank4 no matter what
current bank is.

Signed-off-by: Shaohui Xie <Shaohui.Xie@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>
diff --git a/board/freescale/t4rdb/cpld.c b/board/freescale/t4rdb/cpld.c
index d5f3812..d563d0d 100644
--- a/board/freescale/t4rdb/cpld.c
+++ b/board/freescale/t4rdb/cpld.c
@@ -47,14 +47,8 @@
 
 	switch (curbank) {
 	case CPLD_SELECT_BANK0:
-		altbank = CPLD_SELECT_BANK4;
-		CPLD_WRITE(vbank, altbank);
-		override = CPLD_READ(software_on);
-		CPLD_WRITE(software_on, override | CPLD_BANK_SEL_EN);
-		CPLD_WRITE(sys_reset, CPLD_SYSTEM_RESET);
-		break;
 	case CPLD_SELECT_BANK4:
-		altbank = CPLD_SELECT_BANK0;
+		altbank = CPLD_SELECT_BANK4;
 		CPLD_WRITE(vbank, altbank);
 		override = CPLD_READ(software_on);
 		CPLD_WRITE(software_on, override | CPLD_BANK_SEL_EN);