x86: mm/fault.c declare do_page_fault before they get used

declared do_page_fault() in asm-x86/trap.h for both X86_32 and X86_64

removed do_invalid_op declaration from mm/fault.c as it is already declared in asm-x86/trap.h

Signed-off-by: Jaswinder Singh <jaswinder@infradead.org>
diff --git a/include/asm-x86/traps.h b/include/asm-x86/traps.h
index a4b65a7..b60fab5 100644
--- a/include/asm-x86/traps.h
+++ b/include/asm-x86/traps.h
@@ -51,6 +51,8 @@
 unsigned long patch_espfix_desc(unsigned long, unsigned long);
 asmlinkage void math_emulate(long);
 
+void do_page_fault(struct pt_regs *regs, unsigned long error_code);
+
 #else /* CONFIG_X86_32 */
 
 asmlinkage void double_fault(void);
@@ -62,5 +64,7 @@
 asmlinkage void do_simd_coprocessor_error(struct pt_regs *);
 asmlinkage void do_spurious_interrupt_bug(struct pt_regs *);
 
+asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long error_code);
+
 #endif /* CONFIG_X86_32 */
 #endif /* _ASM_X86_TRAPS_H */