nrf/nrfx_glue: Adapt to nrfx v.1.7.1.
Defining NRFX_STATIC_ASSERT macro to be empty, but available
to nrfx.
#include <soc/nrfx_irqs.h>
+#define NRFX_STATIC_ASSERT(expression)
+
#define NRFX_ASSERT(expression) do { bool res = expression; (void)res; } while (0)
#define NRFX_DELAY_US mp_hal_delay_us
