ARC: AXS10x: cleanup kconfig

As we've dropped NAND support for AXS101 and AXS103
see commit 4f5e552d95bb ("ARC: AXS10x: drop NAND support")
we don't need bounce buffer anymore.

Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index ea87571..6ff201f 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -164,11 +164,9 @@
 
 config TARGET_AXS101
 	bool "Support Synopsys Designware SDP board AXS101"
-	select BOUNCE_BUFFER if CMD_NAND
 
 config TARGET_AXS103
 	bool "Support Synopsys Designware SDP board AXS103"
-	select BOUNCE_BUFFER if CMD_NAND
 
 config TARGET_EMSDP
 	bool "Synopsys EM Software Development Platform"