[U-Boot] Undefined results when building highbank board

[Wolfgang Denk]

Dear Rob,

arch/arm/cpu/armv7/highbank/config.mk contains this setting:

	PLATFORM_CPPFLAGS += -march=armv7-a

This results in code bueing built with the follwoing compiler options:

        ... -march=armv5 -march=armv7-a ...

This is a bad idea - dependign on tool chain used, this may result in
compiler errors ("error: bad value (armv7-a) for -march= switch"), or
undefined behaviour, as it is not clear which option is used by the
compiler.

Can you please provide a fix?  Thanks!

Best regards,

Wolfgang Denk

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