linux/linkage.h: replace VMLINUX_SYMBOL_STR() with __stringify()

With the special case handling for Blackfin and Metag was removed by
commit 94e58e0a ("export.h: remove code for prefixing symbols with
underscore"), VMLINUX_SYMBOL_STR() is now equivalent to __stringify().

Replace the remaining usages in <linux/linkage.h> to prepare for the
entire removal of VMLINUX_SYMBOL_STR().
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

include/linux/linkage.h

@@ -24,16 +24,16 @@
 
 #ifndef cond_syscall
 #define cond_syscall(x)	asm(				\
-	".weak " VMLINUX_SYMBOL_STR(x) "\n\t"		\
-	".set  " VMLINUX_SYMBOL_STR(x) ","		\
-		 VMLINUX_SYMBOL_STR(sys_ni_syscall))
+	".weak " __stringify(x) "\n\t"			\
+	".set  " __stringify(x) ","			\
+		 __stringify(sys_ni_syscall))
 #endif
 
 #ifndef SYSCALL_ALIAS
 #define SYSCALL_ALIAS(alias, name) asm(			\
-	".globl " VMLINUX_SYMBOL_STR(alias) "\n\t"	\
-	".set   " VMLINUX_SYMBOL_STR(alias) ","		\
-		  VMLINUX_SYMBOL_STR(name))
+	".globl " __stringify(alias) "\n\t"		\
+	".set   " __stringify(alias) ","		\
+		  __stringify(name))
 #endif
 
 #define __page_aligned_data	__section(.data..page_aligned) __aligned(PAGE_SIZE)