MIPS: Loongson2ef: Remove unnecessary {as,cc}-option calls

When building with LLVM's integrated assembler, the build errors because
it does not implement -mfix-loongson2f-{jump,nop}:

arch/mips/loongson2ef/Platform:36: *** only binutils >= 2.20.2 have needed option -mfix-loongson2f-nop.  Stop.

The error is a little misleading because binutils are not being used in
this case.

To clear this up, remove the as-option calls because binutils 2.23 is
the minimum supported version for building the kernel. At the same time,
remove the cc-option calls for the '-march=' flags, as GCC 5.1.0 is the
minimum supported version.

This change will not fix the LLVM build for CONFIG_CPU_LOONGSON2{E,F},
as it does not implement the loongson2{e,f} march arguments (nor r4600,
so it will error prior to this change) nor the assembler flags mentioned
above but it will make the errors more obvious.

Link: https://github.com/ClangBuiltLinux/linux/issues/1529
Reported-by: Ryutaroh Matsumoto <ryutaroh@ict.e.titech.ac.jp>
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

arch/mips/loongson2ef/Platform

@@ -2,12 +2,9 @@
 # Loongson Processors' Support
 #
 
-# Only gcc >= 4.4 have Loongson specific support
 cflags-$(CONFIG_CPU_LOONGSON2EF)	+= -Wa,--trap
-cflags-$(CONFIG_CPU_LOONGSON2E) += \
-	$(call cc-option,-march=loongson2e,-march=r4600)
-cflags-$(CONFIG_CPU_LOONGSON2F) += \
-	$(call cc-option,-march=loongson2f,-march=r4600)
+cflags-$(CONFIG_CPU_LOONGSON2E) += -march=loongson2e
+cflags-$(CONFIG_CPU_LOONGSON2F) += -march=loongson2f
 #
 # Some versions of binutils, not currently mainline as of 2019/02/04, support
 # an -mfix-loongson3-llsc flag which emits a sync prior to each ll instruction
@@ -32,16 +29,8 @@ cflags-$(CONFIG_CPU_LOONGSON2EF)	+= $(call as-option,-Wa$(comma)-mno-fix-loongso
 
 # Enable the workarounds for Loongson2f
 ifdef CONFIG_CPU_LOONGSON2F_WORKAROUNDS
-  ifeq ($(call as-option,-Wa$(comma)-mfix-loongson2f-nop,),)
-    $(error only binutils >= 2.20.2 have needed option -mfix-loongson2f-nop)
-  else
-    cflags-$(CONFIG_CPU_NOP_WORKAROUNDS) += -Wa$(comma)-mfix-loongson2f-nop
-  endif
-  ifeq ($(call as-option,-Wa$(comma)-mfix-loongson2f-jump,),)
-    $(error only binutils >= 2.20.2 have needed option -mfix-loongson2f-jump)
-  else
-    cflags-$(CONFIG_CPU_JUMP_WORKAROUNDS) += -Wa$(comma)-mfix-loongson2f-jump
-  endif
+cflags-$(CONFIG_CPU_NOP_WORKAROUNDS) += -Wa,-mfix-loongson2f-nop
+cflags-$(CONFIG_CPU_JUMP_WORKAROUNDS) += -Wa,-mfix-loongson2f-jump
 endif
 
 # Some -march= flags enable MMI instructions, and GCC complains about that