powerpc/64s/paca: EX_SRR0 is unused, remove it

#define EX_R11		16

#define EX_R12		24

#define EX_R13		32

#define EX_SRR0		40

#define EX_DAR		48

#define EX_DSISR	56

#define EX_CCR		60

#define EX_R3		64

#define EX_LR		72

#define EX_CFAR		80

#define EX_PPR		88	/* SMT thread status register (priority) */

#define EX_CTR		96

#define EX_SIZE		13	/* size in u64 units */

#define EX_DAR		40

#define EX_DSISR	48

#define EX_CCR		52

#define EX_R3		56

#define EX_LR		64

#define EX_CFAR		72

#define EX_PPR		80	/* SMT thread status register (priority) */

#define EX_CTR		88

#define EX_SIZE		12	/* size in u64 units */

#ifdef CONFIG_RELOCATABLE

#define __EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)			\