riscv: alternatives: Remove unnecessary define and unused struct

A define and a struct were introduced with commit 6f4eea9
("riscv: Introduce alternative mechanism to apply errata solution"),
which introduced alternatives to RISC-V. The define is used for
an arbitrary string length, specific to sifive errata, so just use
the number directly there instead. The struct has never been used,
so remove it.

Signed-off-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Heiko Stuebner <heiko.stuebner@vrull.eu>
Link: https://lore.kernel.org/r/20230224154601.88163-4-ajones@ventanamicro.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

Author: Andrew Jones

arch/riscv/errata/sifive/errata.c

@@ -14,7 +14,7 @@
 #include <asm/errata_list.h>
 
 struct errata_info_t {
-	char name[ERRATA_STRING_LENGTH_MAX];
+	char name[32];
 	bool (*check_func)(unsigned long  arch_id, unsigned long impid);
 };
 

arch/riscv/include/asm/alternative.h

@@ -6,8 +6,6 @@
 #ifndef __ASM_ALTERNATIVE_H
 #define __ASM_ALTERNATIVE_H
 
-#define ERRATA_STRING_LENGTH_MAX 32
-
 #include <asm/alternative-macros.h>
 
 #ifndef __ASSEMBLY__
@@ -43,11 +41,6 @@ struct alt_entry {
 	u32 errata_id;		/* The errata id */
 };
 
-struct errata_checkfunc_id {
-	unsigned long vendor_id;
-	bool (*func)(struct alt_entry *alt);
-};
-
 void sifive_errata_patch_func(struct alt_entry *begin, struct alt_entry *end,
 			      unsigned long archid, unsigned long impid,
 			      unsigned int stage);