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

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

arch/blackfin/Kconfig

@@ -774,7 +774,6 @@ config C_AMCKEN
 
 config C_CDPRIO
 	bool "DMA has priority over core for ext. accesses"
-	depends on !BF54x
 	default n
 
 config C_B0PEN