Blackfin arch: add bfin_read_MDMA_S0_CONFIG compat for dma_memcpy

Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

diff --git a/arch/blackfin/mach-bf538/include/mach/blackfin.h b/arch/blackfin/mach-bf538/include/mach/blackfin.h
index d10366f..ea25371a9 100644
--- a/arch/blackfin/mach-bf538/include/mach/blackfin.h
+++ b/arch/blackfin/mach-bf538/include/mach/blackfin.h
@@ -82,6 +82,7 @@
 #define bfin_write_MDMA_S0_Y_MODIFY     bfin_write_MDMA0_S0_Y_MODIFY
 #define bfin_write_MDMA_S0_CONFIG       bfin_write_MDMA0_S0_CONFIG
 #define bfin_write_MDMA_D0_CONFIG       bfin_write_MDMA0_D0_CONFIG
+#define bfin_read_MDMA_S0_CONFIG        bfin_read_MDMA0_S0_CONFIG
 #define bfin_read_MDMA_D0_IRQ_STATUS    bfin_read_MDMA0_D0_IRQ_STATUS
 #define bfin_write_MDMA_S0_IRQ_STATUS   bfin_write_MDMA0_S0_IRQ_STATUS