axs101: Enable data cache

There's no reason to keep data cache disabled in axs101
board any longer, enabling it.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
diff --git a/configs/axs101_defconfig b/configs/axs101_defconfig
index 1af505d..b9ea1c6 100644
--- a/configs/axs101_defconfig
+++ b/configs/axs101_defconfig
@@ -1,5 +1,4 @@
 CONFIG_ARC=y
-CONFIG_SYS_DCACHE_OFF=y
 CONFIG_TARGET_AXS101=y
 CONFIG_SYS_TEXT_BASE=0x81000000
 CONFIG_SYS_CLK_FREQ=750000000