Revert "post/Makefile: Only build FP post tests if enabled via CONFIG_SYS_POST_FPU"

This reverts commit 3e16abe0.

The logic of this patch is broken - testing for CONFIG_SYS_POST_FPU in
the Makefile cannot work, as this is only a bit that may (or may not)
be set in the CONFIG_POST variable.

The patch cases build errors on a number of boards, so we revert it.

Signed-off-by: Wolfgang Denk <wd@denx.de>

post/Makefile

@@ -32,7 +32,7 @@ COBJS-$(CONFIG_POST_STD_LIST)	+= tests.o
 SPLIB-$(CONFIG_HAS_POST) = drivers/libpostdrivers.o
 SPLIB-$(CONFIG_HAS_POST) += $(shell if [ -d lib_$(ARCH) ]; then echo \
 			    "lib_$(ARCH)/libpost$(ARCH).o"; fi)
-SPLIB-$(CONFIG_SYS_POST_FPU) += $(shell if [ -d lib_$(ARCH)/fpu ]; then echo \
+SPLIB-$(CONFIG_HAS_POST) += $(shell if [ -d lib_$(ARCH)/fpu ]; then echo \
 			    "lib_$(ARCH)/fpu/libpost$(ARCH)fpu.o"; fi)
 SPLIB-$(CONFIG_HAS_POST) += $(shell if [ -d cpu/$(CPU) ]; then echo \
 			    "cpu/$(CPU)/libpost$(CPU).o"; fi)