Adds missing fully qualified arm arch version. #90
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When building for our platform got #error "unknown CPU architecture: ARM"
The fully qualified arm version for our platform which specifies the FPU is ARM_ARCH_7EM
$ echo | arm-none-eabi-gcc -dM -E -mcpu=cortex-m7 -mthumb -mfpu=fpv5-d16 - | grep ARCH
#define __ARM_ARCH_PROFILE 77
#define __ARM_ARCH_ISA_THUMB 2
#define __ARM_ARCH 7
#define ARM_ARCH_7EM 1
#define ARM_ARCH_EXT_IDIV 1
This was missing in cpu.hpp, hence the PR.