Revert "Update target architecture and FPU settings for ARM toolchain"

This reverts commit cc50788acd, restoring
the soft-float toolchain defaults on dev. The hard-float work continues
on the dev-hard-float branch.

scripts/env.sh

@@ -1,10 +1,10 @@
 
 TOP=`pwd`
 TARGET=arm-uclinuxfdpiceabi
-CFLAGS_TOOLSET='-O2'
-CFLAGS_TARGET='-Os -mthumb -mcpu=cortex-m7 -mfpu=fpv5-d16 -mfloat-abi=hard'
+CFLAGS_TOOLSET='-O2' 
+CFLAGS_TARGET='-Os -mthumb'
 CFLAGS=$CFLAGS_TOOLSET CFLAGS_FOR_TARGET=$CFLAGS_TARGET CXXFLAGS_FOR_TARGET=$CFLAGS_TARGET
-SUBARCH=armv7e-m
-SUBMODE=thumb
+SUBARCH=armv7-m 
+SUBMODE=thumb 
 PATH=${TOP}/${TARGET}/bin:${PATH}