[POWERPC] Fix cpm_uart driver for cpm1 machines

in cpm_uart_cpm1.h, DPRAM_BASE is assigned an address derived from cpmp.
On ARC=ppc, this is a physical address with 1:1 DMA mapping which can't
be used for arithmetric compare operations with virtual addresses
returned by cpm_dpram_addr. This patch changes the assignment to use
cpm_dpram_addr as well, like in cpm_uart_cpm2.h.

Signed-off-by: Jochen Friedrich <jochen@scram.de>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

drivers/serial/cpm_uart/cpm_uart_cpm1.h

@@ -37,6 +37,6 @@ static inline void cpm_set_smc_fcr(volatile smc_uart_t * up)
 	up->smc_tfcr = SMC_EB;
 }
 
-#define DPRAM_BASE	((unsigned char *)&cpmp->cp_dpmem[0])
+#define DPRAM_BASE	((unsigned char *)cpm_dpram_addr(0))
 
 #endif