Replace unavailable flag-preserving instruction
It seems sub requires thumb2 instructions which are unavailable. This is in line with the rest of the sdk code base which uses subs.
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@ -79,7 +79,7 @@ bool clock_configure(enum clock_index clk_index, uint32_t src, uint32_t auxsrc,
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uint delay_cyc = configured_freq[clk_sys] / configured_freq[clk_index] + 1;
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asm volatile (
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"1: \n\t"
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"sub %0, #1 \n\t"
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"subs %0, #1 \n\t"
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"bne 1b"
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: "+r" (delay_cyc)
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);
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