sh: Drop -Wa,-dsp for DSP tuning.

We already hand off the proper ISA variant with the dsp specifier
appended, so we don't need to explicitly set -dsp. This causes some
confusion with certain toolchains that are restricted to -dsp family
opcodes artificially.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/Makefile

@@ -48,8 +48,6 @@ cflags-$(CONFIG_CPU_LITTLE_ENDIAN)	+= -ml
 
 cflags-y	+= $(call as-option,-Wa$(comma)-isa=$(isa-y),) -ffreestanding
 
-cflags-$(CONFIG_SH_DSP)			+= -Wa,-dsp
-
 cflags-$(CONFIG_MORE_COMPILE_OPTIONS)	+= \
 	$(shell echo $(CONFIG_COMPILE_OPTIONS) | sed -e 's/"//g')