ddr: fsl: Remove CONFIG_MEM_INIT_VALUE

The way all of the memory init code here works is that we pass
0xDEADBEEF around for the initial value (as it's a well known 'poison'
value and so easily recognized in debuggers, etc). The only point of
this CONFIG symbol was to pass in a different value for that purpose.
Drop this symbol and cleanup the code slightly.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/powerpc/include/asm/fsl_dma.h b/arch/powerpc/include/asm/fsl_dma.h
index 727f4a7..1459db7 100644
--- a/arch/powerpc/include/asm/fsl_dma.h
+++ b/arch/powerpc/include/asm/fsl_dma.h
@@ -117,7 +117,7 @@
 void dma_init(void);
 int dmacpy(phys_addr_t dest, phys_addr_t src, phys_size_t n);
 #if (defined(CONFIG_DDR_ECC) && !defined(CONFIG_ECC_INIT_VIA_DDRCONTROLLER))
-void dma_meminit(uint val, uint size);
+void dma_meminit(uint size);
 #endif
 #endif