alpha: replace NR_SYSCALLS by NR_syscalls

Reference to other arch likes x86_64 or arm64 to do this replacement.
To solve compile error when using NR_syscalls in kernel[1].

[1] https://lore.kernel.org/all/202203270449.WBYQF9X3-lkp@intel.com/Signed-off-by: Yang Yang <yang.yang29@zte.com.cn>
Signed-off-by: Matt Turner <mattst88@gmail.com>

arch/alpha/include/asm/unistd.h

@@ -4,7 +4,7 @@
 
 #include <uapi/asm/unistd.h>
 
-#define NR_SYSCALLS	__NR_syscalls
+#define NR_syscalls	__NR_syscalls
 
 #define __ARCH_WANT_NEW_STAT
 #define __ARCH_WANT_OLD_READDIR

arch/alpha/kernel/entry.S

@@ -454,7 +454,7 @@ entSys:
 	SAVE_ALL
 	lda	$8, 0x3fff
 	bic	$sp, $8, $8
-	lda	$4, NR_SYSCALLS($31)
+	lda	$4, NR_syscalls($31)
 	stq	$16, SP_OFF+24($sp)
 	lda	$5, sys_call_table
 	lda	$27, sys_ni_syscall
@@ -583,7 +583,7 @@ strace:
 	ldq	$21, 88($sp)
 
 	/* get the system call pointer.. */
-	lda	$1, NR_SYSCALLS($31)
+	lda	$1, NR_syscalls($31)
 	lda	$2, sys_call_table
 	lda	$27, sys_ni_syscall
 	cmpult	$0, $1, $1

kernel/trace/trace.h

@@ -25,7 +25,7 @@
 #include "pid_list.h"
 
 #ifdef CONFIG_FTRACE_SYSCALLS
-#include <asm/unistd.h>		/* For NR_SYSCALLS	     */
+#include <asm/unistd.h>		/* For NR_syscalls	     */
 #include <asm/syscall.h>	/* some archs define it here */
 #endif