linux-yocto/qemuarmv5: fix configuration warning

Integrating the following commit(s) to linux-yocto:

    8c8f6a791be qemuarm: inhibit optimize for size

To fix the following warning:

    [NOTE]: 'CONFIG_CC_OPTIMIZE_FOR_SIZE' last val (y) and .config val (n) do not match
    [INFO]: CONFIG_CC_OPTIMIZE_FOR_SIZE : n ## .config: 159 :configs/v5.10/standard/ktypes/standard/standard.cfg (n) configs/v5.10/standard/arch/arm/arm.cfg (y)
    [INFO]: raw config text:
            config CC_OPTIMIZE_FOR_SIZE
        	    bool "Optimize for size (-Os)"
        	    depends on <choice>
        	    help
        	      Choosing this option will pass "-Os" to your compiler resulting
        	      in a smaller kernel.
            Config 'CC_OPTIMIZE_FOR_SIZE' has the following Direct dependencies (CC_OPTIMIZE_FOR_SIZE=y):
                    <choice>
            Parent dependencies are:
                 choice [y]

We explicitly enable optimize_for_performance in this BSP, but the
arch default is optimize_for_size. These are choice options in the
kernel, so they both can't be enabled.

Unless we tell the audit that we don't want optimize_for_size, it
will notice that fact, and warn that it is not set in the final .config.

[YOCTO #14285]

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>