[MIPS] Remove CONFIG_BUILD_ELF64.
    
This option is no longer usable with supported compilers.  It will be
replaced by usage of -msym32 in a separate patch.
    
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/include/asm-mips/stackframe.h b/include/asm-mips/stackframe.h
index a8919dc..2acf3e8 100644
--- a/include/asm-mips/stackframe.h
+++ b/include/asm-mips/stackframe.h
@@ -63,17 +63,7 @@
 		addu	k1, k0
 		LONG_L	k1, %lo(kernelsp)(k1)
 #endif
-#if defined(CONFIG_64BIT) && !defined(CONFIG_BUILD_ELF64)
-		MFC0	k1, CP0_CONTEXT
-		dsra	k1, 23
-		lui	k0, %hi(pgd_current)
-		addiu	k0, %lo(pgd_current)
-		dsubu	k1, k0
-		lui	k0, %hi(kernelsp)
-		daddu	k1, k0
-		LONG_L	k1, %lo(kernelsp)(k1)
-#endif
-#if defined(CONFIG_64BIT) && defined(CONFIG_BUILD_ELF64)
+#ifdef CONFIG_64BIT
 		MFC0	k1, CP0_CONTEXT
 		lui	k0, %highest(kernelsp)
 		dsrl	k1, 23
@@ -91,11 +81,7 @@
 		mfc0	\temp, CP0_CONTEXT
 		srl	\temp, 23
 #endif
-#if defined(CONFIG_64BIT) && !defined(CONFIG_BUILD_ELF64)
-		lw	\temp, TI_CPU(gp)
-		dsll	\temp, 3
-#endif
-#if defined(CONFIG_64BIT) && defined(CONFIG_BUILD_ELF64)
+#ifdef CONFIG_64BIT
 		MFC0	\temp, CP0_CONTEXT
 		dsrl	\temp, 23
 #endif
@@ -103,7 +89,7 @@
 		.endm
 #else
 		.macro	get_saved_sp	/* Uniprocessor variation */
-#if defined(CONFIG_64BIT) && defined(CONFIG_BUILD_ELF64)
+#ifdef CONFIG_64BIT
 		lui	k1, %highest(kernelsp)
 		daddiu	k1, %higher(kernelsp)
 		dsll	k1, k1, 16