arch/powerpc/cpu/mpc8260/spi.c: Fix GCC 4.6 build warnings

Fix:
spi.c: In function 'spi_init_r':
spi.c:279:22: warning: variable 'cp' set but not used
[-Wunused-but-set-variable]
spi.c: In function 'spi_xfer':
spi.c:361:22: warning: variable 'cp' set but not used
[-Wunused-but-set-variable]

Signed-off-by: Wolfgang Denk <wd@denx.de>

arch/powerpc/cpu/mpc8260/spi.c

@@ -276,11 +276,9 @@ void spi_init_r (void)
 {
 	volatile spi_t *spi;
 	volatile immap_t *immr;
-	volatile cpm8260_t *cp;
 	volatile cbd_t *tbdf, *rbdf;
 
 	immr = (immap_t *)  CONFIG_SYS_IMMR;
-	cp   = (cpm8260_t *) &immr->im_cpm;
 
 	spi  = (spi_t *)&immr->im_dprambase[PROFF_SPI];
 
@@ -358,7 +356,6 @@ ssize_t spi_read (uchar *addr, int alen, uchar *buffer, int len)
 ssize_t spi_xfer (size_t count)
 {
 	volatile immap_t *immr;
-	volatile cpm8260_t *cp;
 	volatile spi_t *spi;
 	cbd_t *tbdf, *rbdf;
 	int tm;
@@ -366,7 +363,6 @@ ssize_t spi_xfer (size_t count)
 	DPRINT (("*** spi_xfer entered ***\n"));
 
 	immr = (immap_t *) CONFIG_SYS_IMMR;
-	cp   = (cpm8260_t *) &immr->im_cpm;
 
 	spi  = (spi_t *)&immr->im_dprambase[PROFF_SPI];