powerpc/mpc85xx: Add defines for serdes RSTCTL register

Also change the define name SRDS_RSTCTL_SDPD to
SRDS_RSTCTL_SDEN, which stands for SerDes enable
as mentioned in SerDes module guide

Signed-off-by: Shaveta Leekha <shaveta@freescale.com>

arch/powerpc/include/asm/immap_85xx.h

@@ -2542,7 +2542,9 @@ typedef struct serdes_corenet {
 #define SRDS_RSTCTL_RSTDONE	0x40000000
 #define SRDS_RSTCTL_RSTERR	0x20000000
 #define SRDS_RSTCTL_SWRST	0x10000000
-#define SRDS_RSTCTL_SDPD	0x00000020
+#define SRDS_RSTCTL_SDEN	0x00000020
+#define SRDS_RSTCTL_SDRST_B	0x00000040
+#define SRDS_RSTCTL_PLLRST_B	0x00000080
 		u32	pllcr0; /* PLL Control Register 0 */
 #define SRDS_PLLCR0_POFF		0x80000000
 #define SRDS_PLLCR0_RFCK_SEL_MASK	0x70000000