MIPS: Remove "__weak" definition from arch-specific linkage.h

"__weak" is defined in include/linux/compiler-gcc.h.  We shouldn't need an
arch-specific definition.

Remove the "__weak" definition from arch/mips/include/asm/linkage.h.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: James Hogan <james.hogan@imgtec.com>
Cc: Andrew Bresticker <abrestic@chromium.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/10689/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/include/asm/linkage.h

@@ -5,7 +5,6 @@
 #include <asm/asm.h>
 #endif
 
-#define __weak __attribute__((weak))
 #define cond_syscall(x) asm(".weak\t" #x "\n" #x "\t=\tsys_ni_syscall")
 #define SYSCALL_ALIAS(alias, name)					\
 	asm ( #alias " = " #name "\n\t.globl " #alias)