Check if 275 us overhead is feasible for nRF54!

Author: cvinayak

subsys/bluetooth/controller/ll_sw/nordic/lll/lll_vendor.h

@@ -25,7 +25,7 @@
 /* Simultaneous 3 extended advertising sets with extended scanning on 1M and Coded PHY, scheduling
  * and receiving auxiliary PDUs.
  */
-#define EVENT_OVERHEAD_START_US 733 /* 24 RTC ticks */
+#define EVENT_OVERHEAD_START_US 275 /* 24 RTC ticks */
 #else /* !CONFIG_BT_CTLR_PHY_CODED */
 /* Active connection in peripheral role with extended scanning on 1M only, scheduling and receiving
  * auxiliary PDUs.