meta-ampere: mtjade: enable dcache in uboot

Currently, the uboot can not jump to Linux kernel due to the watchdog
timeout. This commit enables dcache in uboot to speed up jumping from
uboot to kernel, it made the kernel is booted successfully.

Tested:
      1. Linux kernel is booted successfully.
      2. User can flash new BMC software in u-boot.

Signed-off-by: Thang Tran <thuutran@amperecomputing.com>
Change-Id: I17bce6bdea5168e5c261b44df6ccb16e0ef8a3c1
diff --git a/meta-ampere/meta-jade/recipes-bsp/u-boot/u-boot-aspeed-sdk/ampere.cfg b/meta-ampere/meta-jade/recipes-bsp/u-boot/u-boot-aspeed-sdk/ampere.cfg
index 1fa5d6b..a274dc9 100644
--- a/meta-ampere/meta-jade/recipes-bsp/u-boot/u-boot-aspeed-sdk/ampere.cfg
+++ b/meta-ampere/meta-jade/recipes-bsp/u-boot/u-boot-aspeed-sdk/ampere.cfg
@@ -1,3 +1,4 @@
 CONFIG_PHY_NCSI=n
 CONFIG_CMD_MMC=n
 CONFIG_MMC_SDHCI_ASPEED=n
+CONFIG_SYS_DCACHE_OFF=n