[Blackfin] arch: Restore default DMA priority over core on bf54x.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>

diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig
index a241a0a..ce521a9 100644
--- a/arch/blackfin/Kconfig
+++ b/arch/blackfin/Kconfig
@@ -774,7 +774,6 @@
 
 config C_CDPRIO
 	bool "DMA has priority over core for ext. accesses"
-	depends on !BF54x
 	default n
 
 config C_B0PEN