CONFIG_SPL_SYS_[DI]CACHE_OFF: add

While converting CONFIG_SYS_[DI]CACHE_OFF to Kconfig, there are instances
where these configuration items are conditional on SPL. This commit adds SPL
variants of these configuration items, uses CONFIG_IS_ENABLED(), and updates
the configurations as required.

Acked-by: Alexey Brodkin <abrodkin@synopsys.com>
Signed-off-by: Trevor Woerner <trevor@toganlabs.com>
[trini: Make the default depend on the setting for full U-Boot, update
more zynq hardware]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/bitmain_antminer_s9_defconfig b/configs/bitmain_antminer_s9_defconfig
index 63acd28..3787a95 100644
--- a/configs/bitmain_antminer_s9_defconfig
+++ b/configs/bitmain_antminer_s9_defconfig
@@ -3,6 +3,7 @@
 CONFIG_SYS_BOARD="antminer_s9"
 CONFIG_SYS_CONFIG_NAME="bitmain_antminer_s9"
 CONFIG_ARCH_ZYNQ=y
+CONFIG_SPL_SYS_DCACHE_OFF=y
 CONFIG_SYS_TEXT_BASE=0x4000000
 CONFIG_ENV_OFFSET=0x300000
 CONFIG_SPL_STACK_R_ADDR=0x200000