riscv: lib: Include hwcap.h directly

When using alternatives for cpufeatures we should include hwcap.h
directly, rather than through errata_list.h. Opportunistically drop
an unused include too.
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/20230224154601.88163-6-ajones@ventanamicro.comSigned-off-by: Palmer Dabbelt <palmer@rivosinc.com>

arch/riscv/lib/strcmp.S

@@ -2,9 +2,8 @@
 
 #include <linux/linkage.h>
 #include <asm/asm.h>
-#include <asm-generic/export.h>
 #include <asm/alternative-macros.h>
-#include <asm/errata_list.h>
+#include <asm/hwcap.h>
 
 /* int strcmp(const char *cs, const char *ct) */
 SYM_FUNC_START(strcmp)

arch/riscv/lib/strlen.S

@@ -2,9 +2,8 @@
 
 #include <linux/linkage.h>
 #include <asm/asm.h>
-#include <asm-generic/export.h>
 #include <asm/alternative-macros.h>
-#include <asm/errata_list.h>
+#include <asm/hwcap.h>
 
 /* int strlen(const char *s) */
 SYM_FUNC_START(strlen)

arch/riscv/lib/strncmp.S

@@ -2,9 +2,8 @@
 
 #include <linux/linkage.h>
 #include <asm/asm.h>
-#include <asm-generic/export.h>
 #include <asm/alternative-macros.h>
-#include <asm/errata_list.h>
+#include <asm/hwcap.h>
 
 /* int strncmp(const char *cs, const char *ct, size_t count) */
 SYM_FUNC_START(strncmp)