Fix ISR powerdown in mbed_application.c #4954
Merged
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Fix a calculation error in in powerdown_nvic preventing the last
group of 32 interrupts from getting powered down. The ARMv7m reference
manual states ""the total number of interrupt lines is up
to (32*(INTLINESNUM+1)).".
Also rename isr_count to isr_groups_32 for clarity, since this is
actually the number of 32 interrupt groups.